CVE-2025-53540: CSRF Vulnerability in Firmware Update Endpoints Allows Remote Code Execution

Severity: high (CVSS 8.7 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-07-07 · updated 2026-06-17
Weakness: CWE-352

Description

arduino-esp32 is an Arduino core for the ESP32, ESP32-S2, ESP32-S3, ESP32-C3, ESP32-C6 and ESP32-H2 microcontrollers. Several OTA update examples and the HTTPUpdateServer implementation are vulnerable to Cross-Site Request Forgery (CSRF). The update endpoints accept POST requests for firmware uploads without CSRF protection. This allows an attacker to upload and execute arbitrary firmware, resulting in remote code execution (RCE). This vulnerability is fixed in 3.2.1.

Affected products

espressif arduino-esp32: before 3.2.1

References

https://github.com/espressif/arduino-esp32/commit/f4fdecc60c465384e465a4b1d2bd1eac8f67912e
https://github.com/espressif/arduino-esp32/security/advisories/GHSA-9vfw-wx65-c872

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