Cloudflare Exploit. Some CDN vendors did In late 2025, researchers at FearsOff Security u

Some CDN vendors did In late 2025, researchers at FearsOff Security uncovered a zero-day vulnerability in Cloudflare’s Web Application Firewall (WAF) that allowed external actors The cybersecurity landscape, malicious actors, including notorious ransomware groups like BlackSuit, Royal, Akira, Scattered Spider, Medusa, and Exploit Development Process & Cloudflare Bypass Method After extensive effort and detailed work, I wrote a simple and unobtrusive code that I Introduction Recent research has uncovered a vulnerability that potentially allows attackers to bypass specific security measures provided by GitHub is where people build software. The “HTTP/2 Rapid Reset” attack exploits a weakness in the HTTP/2 protocol to generate enormous, hyper-volumetric DDoS attacks. md First to patch vs. A massive blind spot in Cloudflare’s security recently left millions of servers exposed to a critical zero-day exploit. Therefore, once we . The root cause was a mix of BGP (Border This policy provides our guidelines for reporting vulnerabilities to Cloudflare. Threat actors have been observed abusing the open source Cloudflare Tunnel tool Cloudflared to maintain persistent access to systems. Explore the latest vulnerabilities and security issues of Cloudflare in the CVE database Ransomware groups use Cloudflare’s Cloudflared to create covert tunnels, bypassing network defenses and maintaining persistent access. A recently discovered security vulnerability dubbed "BreakingWAF" in the configuration of web application firewall (WAF) services. Cloudflare Malware campaign abuses Cloudflare Tunnel and phishing lures to deliver in-memory RATs across multiple regions. Because of this breach, A set of vulnerabilities in Cloudflare's security infrastructure has been identified, potentially allowing attackers to bypass the company's Firewall and Cloudflare is laying the blame for the cyberattack it suffered late last year the after-effects of the critical Okta breach. Read the executive breach summary. Learn how this joint When someone performs a request to a Cloudflare customer's website via HTTP/2, Cloudflare applies weaker validation after the 100th header The WannaCry ransomware attack occurred on May 12, 2017, and impacted more than 200,000 computers in more than 150 countries. A Cloudflare Zero-Day flaw let attackers bypass WAF protections by abusing the ACME certificate validation path, exposing protected origin servers. Cloudflare fixed a flaw in its ACME validation logic that could let attackers bypass security checks and access protected origin servers. Cloudflare has announced that its internal Atlassian server was breached by a 'nation state attacker'. 7% of all websites on the internet. We will update later with Earlier today, Cloudflare, along with Google and Amazon AWS, disclosed the existence of a novel zero-day vulnerability dubbed the “HTTP/2 Hackers are increasingly abusing the legitimate Cloudflare Tunnel feature to create stealthy HTTPS connections from compromised devices, #Exploit: A successful attempt would require the local user to be able to insert their code in the system root path undetected by the OS or other security applications where it could potentially Learn how cybercriminals exploit Cloudflare Tunnels to deliver malware and evade detection, posing significant threats to network security and On Wednesday of last week, details of the Shellshock bash bug emerged. Tavis notified Cloudflare immediately. WannaCry is still active today. Cloudflare has fixed a critical vulnerability in its free and open-source CDNJS potentially impacting 12. Adversaries Leverage Cloudflare’s TryCloudflare for Stealthy RAT Deployment The underlying campaigns employ elaborate, multi-step infection In mid-May 2025, Cloudflare blocked the largest DDoS attack ever recorded: a staggering 7. Cloudflare’s data is able to augment CISA’s vulnerability report — of note, we see attempts to exploit the top two vulnerabilities that are several In this post we explain the history of this vulnerability, how it was introduced, how Cloudflare is protecting our clients. Just hit watch, then grab your custom Unique 0-click deanonymization attack targeting Signal, Discord and hundreds of platform - research. Hacker performing the Cloudflare hack 2. Threat actors leveraged Cloudflare Tunnels through malicious PyPI packages for data theft and remote device access. On August 23rd, Cloudflare was notified that we (and our customers) are affected by the Salesloft Drift breach. Add evasions to skip blocks by understanding how it works and what sensor data it sends. watch. dev' domains, used for deploying web pages and facilitating serverless computing, are being Yesterday, August 8, 2022, Twilio shared that they’d been compromised by a targeted phishing attack. More than 150 million people use GitHub to discover, fork, and contribute to over 420 million projects. RSS Feeds for CloudFlare security vulnerabilities Create a CVE RSS feed including security vulnerabilities found in CloudFlare products with stack. A The surge of 198% in attacks abusing Cloudflare Pages and the 104% increase in attacks on Cloudflare Workers highlight cybercriminals’ Explore Cloudflare's Image Proxy as a CSPT exploit tool, enabling impactful cross-origin path traversal attacks through redirect techniques A string of international DNS hijacking attacks is being carried out against high-profile targets. A few features in The Cloudflare Public Bug Bounty Bug Bounty Program enlists the help of the hacker community at HackerOne to make Cloudflare Public Bug Bounty more secure. In 2025, Cloudflare Tunnel abuse is on the rise as attackers exploit it to hide malicious activities and evade detection. Cloudflare patched an ACME HTTP-01 validation flaw that disabled WAF protections and let unauthorized requests reach origin servers. Recently, a RCE vulnerability in the way cdnjs’ backend is automatically keeping web resources up to date has been disclosed. While it doesn't have any nickname yet (last year's Ghost was Cloudflare observed a case of an attacker deploying a PoC-based exploit 22 minutes after its publication, leaving defenders essentially no margin Exploiting Cloudflare Tunnel requires little skill and potentially could compromise and entire network. White-hat hackers found a way to bypass the Web Application Firewall A Cloudflare Zero-Day flaw let attackers bypass WAF protections by abusing the ACME certificate validation path, exposing protected origin servers. ClickFix uses fake CAPTCHA screens to trick users into launching malware via simple keyboard commands The phishing page mimics Cloudflare Learn how to bypass Cloudflare Bot Management. A must-read for security pros. Early activity indicates that threat actors quickly integrated this vulnerability into their scanning and reconnaissance routines and targeted Exploiting Adminer : SSRF enabling to Bypass Cloudflare in place and leading to the exploitation of CVE-2021–43008 Summary Discovered a subdomain which is running a vulnerable Cloudflare recently released its 2024 Application Security Report, offering recommendations and insights on addressing many raised concerns. Take a close look at the most important trends shaping the web application and API threat landscape today, including vulnerability exploitation, DDoS attacks, bot They exploit Cloudflare Tunnels’ TryCloudflare feature to distribute malware, primarily Xworm RAT. Around the same time as Twilio was attacked, we saw ClickFix uses fake Cloudflare checks to trick users into running malware commands, marking a shift from file downloads to direct execution. FearsOff reported the vulnerability through Cloudflare’s bug bounty on October 13, 2025. first to exploit—the race between defenders and attackers accelerates: Cloudflare observed faster exploitations than ever of new zero-day vulnerabilities, with one occurring An interesting zero-click flaw was found in Cloudflare mechanism by a young cybersecurity researcher, potentially allowing for location reveal. 3 terabits per second (Tbps). However, public disclosure didn’t A Cloudflare Zero-Day flaw let attackers bypass WAF protections by abusing the ACME certificate validation path, exposing protected origin servers. Discover how a Cloudflare WAF bypass in /. 1. Cloudflare threat reports Stay ahead of the latest cybersecurity threats Get in-depth analysis of emerging threats, threat actors, and attack trends, along with By placing their malware on Cloudflare’s infrastructure and subdomains, attackers increase their likelihood of avoiding network monitoring Researchers have discovered and analyzed a ClickFix attack that uses a fake Cloudflare ‘humanness’ check. Cloudflare has NotCVE-2026-0001 Cloudflare Universal SSL CAA augmentation may enable unauthorized DV certificate issuance by weakening RFC 8657 account binding I wrote earlier about how to mitigate CVE-2021-44228 in Log4j, how the vulnerability came about and Cloudflare’s mitigations for our customers. Learn more here. Attackers can exploit the flaw similarly in Discord, with potentially wider impact, using a custom emoji that's loaded from Discord's CDN and A remote code execution (RCE) attack is where an attacker runs malicious code on an organization’s network. 1 was unreachable or degraded. Learn how to prevent DNS hijacking. well-known/acme-challenge/ exposed origins, its impact, and the fix. Cloudflare deployed a fix on October 27—a 14-day turnaround. Learn how it works and why it’s important. CDNJS A zero-day exploit, also called a zero-day threat or attack, takes advantage of a security vulnerability that does not have a fix in place. CVE search result Notice: Expanded keyword searching of CVE Records (with limitations) is now available in the search box above. Cloudflare provides a variety of services to a lot of websites - a few million, in fact. The pervasive issue of password Cloudflare works with industry partners to disrupt an ongoing social engineering campaign targeting sensitive data collection. Cloudflare offers protection against a new high profile vulnerability for React Server Components: CVE-2025-55182. In October of 2023, Cloudflare helped lead the disclosure of a zero-day vulnerability in the HTTP/2 protocol that allows for high-volume DDoS attacks against HTTP A buffer overflow error in GNU libc DNS stub resolver code was announced last week as CVE-2015-7547. Using Cloudflare to secure Cloudflare All of our internal services are protected by our Zero-trust product, Cloudflare Access. Nearly half of observed login attempts across websites protected by Cloudflare involved leaked credentials. This change in mitigation rankings may be due to more enterprises using WAF rules to block brute-force attacks or credential stuffing and prevent sensitive data from being exfiltrated from apps, or using Gaps in Cloudflare’s security controls allow users to bypass protections and target others from the platform itself. As I Cloudflare's TryCloudflare is being exploited by cybercriminals for malware delivery via phishing emails, reports say. 6 terabits per second and came from a Mirai-based botnet with Get the latest news on how products at Cloudflare are built, technologies used, and open positions to join the teams helping to build a better Internet. The feature being abused is called Cloudflare Tunnels, which allow users to create secure, outbound-only connections to the Cloudflare network for web servers and applications. Cloudflare has disclosed a significant data breach affecting customer information following a sophisticated supply chain attack. By leveraging the service’s temporary nature, Learn about a new phishing campaign that’s exploiting Cloudflare Workers and HTML smuggling to steal user credentials. This bug started a scramble to patch computers, servers, routers, firewalls, and other computing appliances In this blog post we will cover WAF evasion patterns and exfiltration attempts seen in the wild, trend data on attempted exploitation, and information The team began researching the exploit the evening of July 20, and on July 21, 2025, Cloudflare deployed our emergency WAF Managed Rules to Cloudflare fixed a 2026 ACME validation vulnerability allowing attackers to bypass WAF protections and access origin servers. HackerOne is the #1 hacker The largest distributed denial-of-service (DDoS) attack to date peaked at 5. Because Cloudflare doesn't allow direct requests to individual datacenters, Daniel exploited a bug in Cloudflare Workers' serverless scripting Mitigation: Cloudflare does not cache HTTP status code 400 responses by default, which is the common denial of service vector called out by the exploit authors. The content delivery service Key Statistics Our data indicates a growing trend in DDoS attacks against these organizations, becoming more common than attempts to exploit traditional web application On June 27, 2024, a small number of users globally may have noticed that 1. A nation-state threat actor hacked Cloudflare and accessed internal systems using credentials stolen during the Okta hack. Read Cloudflare announced that it has blocked a record-breaking 5. 6 terabit-per-second (Tbps) distributed denial-of-service (DDoS) attack. dev' and 'workers. All WAF customers are Cloudflare's 'pages.

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