Vulnerability Description
ESPAsyncWebServer is an asynchronous HTTP and WebSocket server library for ESP32, ESP8266, RP2040 and RP2350. In versions up to and including 3.7.8, a CRLF (Carriage Return Line Feed) injection vulnerability exists in the construction and output of HTTP headers within `AsyncWebHeader.cpp`. Unsanitized input allows attackers to inject CR (`\r`) or LF (`\n`) characters into header names or values, leading to arbitrary header or response manipulation. Manipulation of HTTP headers and responses can enable a wide range of attacks, making the severity of this vulnerability high. A fix is available at pull request 211 and is expected to be part of version 3.7.9.
Related Weaknesses (CWE)
References
- https://github.com/ESP32Async/ESPAsyncWebServer/blob/1095dfd1ecf1a903aede2985423
- https://github.com/ESP32Async/ESPAsyncWebServer/pull/211
- https://github.com/ESP32Async/ESPAsyncWebServer/security/advisories/GHSA-87j8-6f
FAQ
What is CVE-2025-53094?
CVE-2025-53094 is a documented vulnerability. ESPAsyncWebServer is an asynchronous HTTP and WebSocket server library for ESP32, ESP8266, RP2040 and RP2350. In versions up to and including 3.7.8, a CRLF (Carriage Return Line Feed) injection vulner...
How severe is CVE-2025-53094?
CVSS scoring is not yet available for CVE-2025-53094. Check NVD for updates.
Is there a patch for CVE-2025-53094?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.