WAF Emergency Release – Enhanced React RCE & Server Function Detections
This emergency WAF release improves detection logic for React Remote Code Execution (CVE-2025-55182) and adds two new generic detections for server-side function source code exposure and resource exhaustion patterns. These updates strengthen protection against RCE exploitation and common server-function abuse techniques.
This additional week's emergency release introduces improvements to our existing rule for React – Remote Code Execution – CVE-2025-55182 - 2, along with two new generic detections covering server-side function exposure and resource-exhaustion patterns.
Key Findings
Enhanced detection logic for React – RCE – CVE-2025-55182, added Generic – Server Function Source Code Exposure, and added Generic – Server Function Resource Exhaustion.
Impact
These updates strengthen protection against React RCE exploitation attempts and broaden coverage for common server-function abuse techniques that may expose internal logic or disrupt application availability.
| Ruleset | Rule ID | Legacy Rule ID | Description | Previous Action | New Action | Comments |
|---|---|---|---|---|---|---|
| Cloudflare Managed Ruleset | ...15fce168 | N/A | React - Remote Code Execution - CVE:CVE-2025-55182 - 2 | N/A | Block | This is an improved detection. |
| Cloudflare Free Ruleset | ...74746aff | N/A | React - Remote Code Execution - CVE:CVE-2025-55182 - 2 | N/A | Block | This is an improved detection. |
| Cloudflare Managed Ruleset | ...fefb4e9b | N/A | Generic - Server Function Source Code Exposure | N/A | Block | This is a new detection. |
| Cloudflare Free Ruleset | ...251e86aa | N/A | Generic - Server Function Source Code Exposure | N/A | Block | This is a new detection. |
| Cloudflare Managed Ruleset | ...102ec699 | N/A | Generic - Server Function Resource Exhaustion | N/A | Disabled | This is a new detection. |
Source: original entry ↗
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