How severe is CVE-2025-53540?

CVE-2025-53540 has a CVSS 4.0 base score of 8.7, rated high severity.

Is CVE-2025-53540 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-53540?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-53540 have an EU (EUVD) identifier?

Yes. CVE-2025-53540 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-20306.

When was CVE-2025-53540 published?

CVE-2025-53540 was published on 2025-07-07 and last updated on 2026-06-17.

CVE-2025-53540

CVE-2025-53540 is a high-severity vulnerability with a CVSS 4.0 base score of 8.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-352.

Key facts

Severity: High (CVSS 4.0 base score 8.7)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-20306
Weakness: CWE-352
Published: 2025-07-07
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-53540?: 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.
How severe is CVE-2025-53540?: CVE-2025-53540 has a CVSS 4.0 base score of 8.7, rated high severity.
Is CVE-2025-53540 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-53540?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-53540 have an EU (EUVD) identifier?: Yes. CVE-2025-53540 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-20306.
When was CVE-2025-53540 published?: CVE-2025-53540 was published on 2025-07-07 and last updated on 2026-06-17.

References

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