CVE-2025-53094 - CVE House
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Status published High CVE-2025-53094

ESPAsyncWebServer Vulnerable to CRLF Injection in AsyncWebHeader.cpp

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

Affected Vendor

Affected Software

ESPAsyncWebServer
Vulnerable Versions:
<= 3.7.8

Timeline

Official Publish: June 27th, 2025
Last Modified: June 27th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

Weaknesses (CWE)

CWE-93 CWE-113

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.