WAF Release - New rules for critical infrastructure vulnerabilities
Cloudflare WAF adds new detection rules for critical vulnerabilities in Citrix NetScaler ADC/Gateway (CVE-2026-8451) and Progress Kemp LoadMaster (CVE-2026-8037). These rules block exploitation attempts against unauthenticated memory disclosure and remote code execution flaws.
This release introduces new rules targeting critical infrastructure vulnerabilities. These include an unauthenticated memory disclosure flaw in Citrix NetScaler ADC and Gateway (CVE-2026-8451) and a high-severity pre-authentication remote code execution (RCE) vulnerability in Progress Kemp LoadMaster (CVE-2026-8037).
Key Findings
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CVE-2026-8451: An insufficient input validation vulnerability affects Citrix NetScaler ADC and NetScaler Gateway appliances configured as a SAML Identity Provider (IdP). Remote, unauthenticated attackers can exploit this flaw by sending malformed requests to trigger a memory overread, allowing them to leak chunks of sensitive data from adjacent appliance memory.
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CVE-2026-8037: A critical OS command injection vulnerability in Progress Kemp LoadMaster load balancers allows unauthenticated remote attackers to achieve remote code execution (RCE).
| Ruleset | Rule ID | Legacy Rule ID | Description | Previous Action | New Action | Comments |
|---|---|---|---|---|---|---|
| Cloudflare Managed Ruleset | ...76973ac4 | N/A | Citrix Netscaler ADC - Insufficient Input Validation - CVE:CVE-2026-8451 | Log | Block | This is a new detection. |
| Cloudflare Managed Ruleset | ...10233f36 | N/A | Progress Kemp LoadMaster - Remote Code Execution - CVE:CVE-2026-8037 | Log | Block | This is a new detection. |
Source: original entry ↗
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