CVE-2025-53007

Name of the Vulnerable Software and Affected Versions: arduino-esp32 versions prior to 3.3.0-RC1 and 3.2.1

Description: The issue concerns a HTTP Response Splitting vulnerability. The sendHeader function takes arbitrary input for the HTTP header name and value, concatenates them into an HTTP header line, and appends this to the outgoing HTTP response headers. There is no validation or sanitization of the name or value parameters before they are included in the HTTP response. If an attacker can control the input to sendHeader, they could inject carriage return (r) or line feed ( ) characters into either the header name or value. This could allow the attacker to inject additional headers, manipulate the structure of the HTTP response, potentially inject an entire new HTTP response, and/or cause header confusion or other HTTP protocol attacks.

Recommendations: For versions prior to 3.3.0-RC1, update to version 3.3.0-RC1 or later. For versions prior to 3.2.1, update to version 3.2.1 or later. As a temporary workaround, consider validating and sanitizing the input to the sendHeader function to prevent injection of malicious characters.