{"id":21857,"date":"2025-11-19T17:07:05","date_gmt":"2025-11-19T15:07:05","guid":{"rendered":"https:\/\/www.papaki.com\/blog\/?p=21857"},"modified":"2025-11-19T17:07:05","modified_gmt":"2025-11-19T15:07:05","slug":"cloudflare-down-what-is-a-web-application-firewall","status":"publish","type":"post","link":"https:\/\/www.papaki.com\/blog\/en\/2025\/11\/19\/cloudflare-down-what-is-a-web-application-firewall\/","title":{"rendered":"Cloudflare down: What is a Web Application Firewall and why did thousands of sites go down?"},"content":{"rendered":"<p><span data-contrast=\"auto\">If you tried to visit your favorite websites yesterday and\u00a0encountered\u00a0problems, you\u00a0probably wondered\u00a0<\/span><b><span data-contrast=\"auto\">what Cloudflare is<\/span><\/b><span data-contrast=\"auto\">\u00a0that &#8220;went down&#8221; and affected the global web.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">To start with, Cloudflare provides\u00a0<\/span><b><span data-contrast=\"auto\">Web Application Firewall (WAF) services<\/span><\/b><span data-contrast=\"auto\">, but let&#8217;s take a look at what that means in simple terms, how it works, and why it&#8217;s so important for any online business.\u00a0\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<h3 aria-level=\"3\"><b><span data-contrast=\"auto\">What is a\u00a0Web Application Firewall (WAF);<\/span><\/b><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:281,&quot;335559739&quot;:281}\">\u00a0<\/span><\/h3>\n<p><span data-contrast=\"auto\">A\u00a0web\u00a0application\u00a0firewall\u00a0(WAF)\u00a0is\u00a0used\u00a0to\u00a0<\/span><b><span data-contrast=\"auto\">protect\u00a0web\u00a0applications\u00a0from\u00a0common\u00a0cyber\u00a0attacks<\/span><\/b><span data-contrast=\"auto\">,\u00a0such\u00a0as\u00a0denial-of-service\u00a0attacks\u00a0(DoS),\u00a0DDoS, and\u00a0many\u00a0other\u00a0types\u00a0of\u00a0malicious\u00a0activity.\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">In practice, it acts as a &#8220;<\/span><b><span data-contrast=\"auto\">shield<\/span><\/b><span data-contrast=\"auto\">&#8221; between web applications and internet traffic. It\u00a0<\/span><b><span data-contrast=\"auto\">monitors, filters, and blocks suspicious and malicious HTTP traffic\u00a0<\/span><\/b><span data-contrast=\"auto\">through its multi-layered security.\u00a0\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<p><b><span data-contrast=\"auto\">Who\u00a0is\u00a0it\u00a0for?<\/span><\/b><span data-contrast=\"auto\">\u00a0It\u00a0is\u00a0particularly\u00a0useful\u00a0for\u00a0<\/span><b><span data-contrast=\"auto\">e-commerce companies, eShops, and all businesses<\/span><\/b><span data-contrast=\"auto\">\u00a0that\u00a0interact\u00a0with\u00a0their\u00a0customers\u00a0mainly\u00a0<\/span><b><span data-contrast=\"auto\">online<\/span><\/b><span data-contrast=\"auto\">.\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">Therefore, as you can see, the recent bug in Cloudflare&#8217;s software, which serves a huge part of the internet by filtering traffic through its global network, <\/span><b><span data-contrast=\"auto\">affected many websites and services worldwide at the same time, making them inaccessible or seriously degrading their functionality<\/span><\/b><span data-contrast=\"auto\">.\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">Let&#8217;s\u00a0now\u00a0look\u00a0at\u00a0why\u00a0it\u00a0is\u00a0worth\u00a0using\u00a0a WAF.\u00a0\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<h3><b><span data-contrast=\"auto\">Why\u00a0use\u00a0a Web\u00a0Application\u00a0Firewall?<\/span><\/b><span data-ccp-props=\"{}\">\u00a0<\/span><\/h3>\n<p><span data-contrast=\"auto\">A web application\u00a0firewall\u00a0can have multiple benefits, such as:<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<h4><span style=\"color: #000000;\">1. Preventing bad bot attacks<\/span><\/h4>\n<p><span data-contrast=\"auto\">Bot\u00a0attacks\u00a0are\u00a0<\/span><b><span data-contrast=\"auto\">harmful\u00a0to\u00a0any\u00a0website\u00a0<\/span><\/b><span data-contrast=\"auto\">and a\u00a0company&#8217;s\u00a0<\/span><b><span data-contrast=\"auto\">reputation<\/span><\/b><span data-contrast=\"auto\">, and\u00a0can\u00a0cause\u00a0significant\u00a0problems:<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<ul>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"14\" data-list-defn-props=\"{&quot;134225954&quot;:true,&quot;134225961&quot;:true,&quot;335552541&quot;:1,&quot;335559683&quot;:0,&quot;335559684&quot;:-2,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"6\" data-aria-level=\"1\"><span data-contrast=\"auto\">overloading with fake traffic<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/li>\n<\/ul>\n<ul>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"14\" data-list-defn-props=\"{&quot;134225954&quot;:true,&quot;134225961&quot;:true,&quot;335552541&quot;:1,&quot;335559683&quot;:0,&quot;335559684&quot;:-2,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"7\" data-aria-level=\"1\"><span data-contrast=\"auto\">spam in forms and comments\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/li>\n<\/ul>\n<ul>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"14\" data-list-defn-props=\"{&quot;134225954&quot;:true,&quot;134225961&quot;:true,&quot;335552541&quot;:1,&quot;335559683&quot;:0,&quot;335559684&quot;:-2,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"8\" data-aria-level=\"1\"><span data-contrast=\"auto\">brute force attempts<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/li>\n<\/ul>\n<ul>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"14\" data-list-defn-props=\"{&quot;134225954&quot;:true,&quot;134225961&quot;:true,&quot;335552541&quot;:1,&quot;335559683&quot;:0,&quot;335559684&quot;:-2,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"9\" data-aria-level=\"1\"><span data-contrast=\"auto\">DDoS attacks<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/li>\n<\/ul>\n<ul>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"14\" data-list-defn-props=\"{&quot;134225954&quot;:true,&quot;134225961&quot;:true,&quot;335552541&quot;:1,&quot;335559683&quot;:0,&quot;335559684&quot;:-2,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"10\" data-aria-level=\"1\"><span data-contrast=\"auto\">stealing sensitive user information<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"auto\">Using a WAF\u00a0identifies\u00a0and blocks malicious bot traffic, reducing the need for separate bot-blocker tools or complex defense strategies.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<h4><span style=\"color: #000000;\">2. Patching insecure code<\/span><\/h4>\n<p><span data-contrast=\"auto\">Although DevOps engineers\u00a0frequently\u00a0update web applications to address any bugs, vulnerabilities may remain due to delays in security updates.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">\u00a0In\u00a0such\u00a0cases, a WAF\u00a0can\u00a0be\u00a0helpful.\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">Many WAF tools, such as Cloudflare, offer\u00a0<\/span><b><span data-contrast=\"auto\">virtual patching<\/span><\/b><span data-contrast=\"auto\">, a strategy that reduces the risk from vulnerabilities that have not yet been fixed. It is not a\u00a0long-term\u00a0solution, but it gives security teams\u00a0enough\u00a0time to\u00a0work\u00a0on\u00a0the vulnerabilities\u00a0before cybercriminals exploit it.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<h4><span style=\"color: #000000;\">3. Maintaining security compliance<\/span><\/h4>\n<p><span data-contrast=\"auto\">WAF\u00a0is also\u00a0helpful for\u00a0online businesses\u00a0in\u00a0automating the process of meeting<\/span><b><span data-contrast=\"auto\">\u00a0regulatory security\u00a0compliance<\/span><\/b><span data-contrast=\"auto\">, such as GDPR for personal data protection and PCI DSS for payment card data security in\u00a0eShops.\u00a0<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">Failure to comply with these regulations can have\u00a0<\/span><b><span data-contrast=\"auto\">significant consequences for a business<\/span><\/b><span data-contrast=\"auto\">. Using\u00a0WAF\u00a0is one of the most effective ways to ensure\u00a0meeting these requirements.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h4><span style=\"color: #000000;\">\u202f4.\u00a0Real-time intrusion detection\u00a0\u00a0<\/span><\/h4>\n<p><span data-contrast=\"auto\">A WAF\u00a0helps\u00a0security\u00a0teams\u00a0<\/span><b><span data-contrast=\"auto\">detect\u00a0threats\u00a0and\u00a0attempted\u00a0intrusions\u00a0in\u00a0real\u00a0time<\/span><\/b><span data-contrast=\"auto\">.\u00a0<\/span><span data-contrast=\"auto\">HTTP traffic is\u00a0<\/span><b><span data-contrast=\"auto\">monitored\u00a0automatically, 24\/7<\/span><\/b><span data-contrast=\"auto\">, while most WAFs offer\u00a0additional\u00a0features:<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:0,&quot;335559740&quot;:240}\">\u00a0<\/span><\/p>\n<ul>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"15\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559683&quot;:0,&quot;335559684&quot;:-2,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"4\" data-aria-level=\"1\"><span data-contrast=\"auto\">post-incident analysis<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/li>\n<\/ul>\n<ul>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"15\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559683&quot;:0,&quot;335559684&quot;:-2,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"5\" data-aria-level=\"1\"><span data-contrast=\"auto\">security audits<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/li>\n<\/ul>\n<ul>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"15\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559683&quot;:0,&quot;335559684&quot;:-2,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"6\" data-aria-level=\"1\"><span data-contrast=\"auto\">security\u00a0measures\u00a0after\u00a0an\u00a0attack.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><b><span data-contrast=\"auto\">If\u00a0you\u00a0want\u00a0to\u00a0install a firewall on your site<\/span><\/b><span data-contrast=\"auto\">,\u00a0you\u00a0can\u00a0either\u00a0do\u00a0it\u00a0yourself\u00a0or,\u00a0if\u00a0you\u00a0don&#8217;t have the technical skills, ask your programmer for help.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<h3><span style=\"color: #000000;\"><b>How\u00a0to\u00a0protect\u00a0your\u00a0business\u00a0with\u00a0the\u00a0right\u00a0use\u00a0of WAF<\/b>\u00a0<\/span><\/h3>\n<p><span data-contrast=\"auto\">To get the most out of a Web\u00a0Application\u00a0Firewall\u00a0and\u00a0reduce\u00a0the\u00a0risk\u00a0of\u00a0downtime\u00a0or\u00a0attacks,\u00a0follow\u00a0a\u00a0few\u00a0basic\u00a0practices:\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<ul>\n<li><b><span data-contrast=\"auto\">Choose a reliable WAF<\/span><\/b><br \/>\n<span data-contrast=\"auto\">Opt for cloud-based solutions that update automatically and offer protection against new types of attacks.<\/span><\/li>\n<li><b><span data-contrast=\"auto\">Configure\u00a0security\u00a0rules\u00a0correctly<\/span><\/b><br \/>\n<span data-contrast=\"auto\">Enable\u00a0bot\u00a0protection,\u00a0rate\u00a0limiting, and\u00a0malicious\u00a0activity\u00a0detection.\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"auto\">Monitoralerts and reports\u00a0<\/span><\/b><br \/>\n<span data-contrast=\"auto\">Most\u00a0WAFs\u00a0provide real-time alerts.\u00a0Immediate\u00a0response\u00a0is\u00a0important.\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"auto\">CombineWAF\u00a0with\u00a0regular\u00a0updates\u00a0<\/span><\/b><br \/>\n<span data-contrast=\"auto\">Even\u00a0with\u00a0WAF, CMS and\u00a0plugin\u00a0security\u00a0remains\u00a0critical,\u00a0as\u00a0it\u00a0reduces\u00a0the\u00a0likelihood\u00a0of\u00a0vulnerabilities\u00a0being\u00a0exploited.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"auto\">Properly\u00a0configuring\u00a0and\u00a0monitoring\u00a0a\u00a0firewall\u00a0is\u00a0one\u00a0of the\u00a0most\u00a0essential\u00a0steps\u00a0in\u00a0protecting\u00a0any\u00a0online\u00a0business.\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<h3><span style=\"color: #000000;\"><b>Conclusion<\/b>\u00a0<\/span><\/h3>\n<p><span data-contrast=\"auto\">A Web Application Firewall (WAF) is installed on web applications and websites to protect them from cyberattacks. It acts as a &#8220;shield&#8221; between the web server and malicious users, protecting against data leaks and breaches.\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">In short, a WAF is one of the<\/span><b><span data-contrast=\"auto\">\u00a0most essential mechanisms for effectively enhancing the overall security of your site<\/span><\/b><span data-contrast=\"auto\">, and Cloudflare&#8217;s recent problems have reminded us of this in the clearest\u00a0possible way.\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:0,&quot;335551620&quot;:0,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<h6>Read more:<\/h6>\n<p class=\"text-light text-center emphasis aos-init aos-animate\" data-aos=\"fade-up\" data-aos-delay=\"0\"><a href=\"https:\/\/www.papaki.com\/blog\/en\/2021\/11\/26\/a-slow-website-costs-you\/\" target=\"_blank\" rel=\"noopener\">How much does a slow website cost you?<\/a><\/p>\n<p class=\"text-light text-center emphasis aos-init aos-animate\" data-aos=\"fade-up\" data-aos-delay=\"0\"><a href=\"https:\/\/www.papaki.com\/blog\/en\/2023\/12\/04\/what-is-otp\/\" target=\"_blank\" rel=\"noopener\">What is OTP, and why is it important?\u00a0<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>If you tried to visit your favorite websites yesterday and\u00a0encountered\u00a0problems, you\u00a0probably wondered\u00a0what&#8230; <a class=\"text-colored text-underlined\" href=\"https:\/\/www.papaki.com\/blog\/en\/2025\/11\/19\/cloudflare-down-what-is-a-web-application-firewall\/\">\u03a0\u03b5\u03c1\u03b9\u03c3\u03c3\u03cc\u03c4\u03b5\u03c1\u03b1<\/a><\/p>\n","protected":false},"author":52,"featured_media":21855,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"mc4wp_mailchimp_campaign":[],"footnotes":""},"categories":[2078],"tags":[5238,5230,5240,5242,5236,5234,5232],"coauthors":[3452],"class_list":["post-21857","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-security_en","tag-cloudflare-down-en","tag-cloudflare-issue","tag-cloudflare-waf-en","tag-web-application-firewall-en","tag-what-is-a-firewall","tag-what-is-cloudflare","tag-what-is-waf"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Cloudflare down: What is a Web Application Firewall and why did thousands of sites go down? - Papaki Blog<\/title>\n<meta name=\"description\" content=\"Many websites faced issues due to a Cloudflare outage. 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