What is CVE-2025-52496?

CVE-2025-52496 is a high-severity vulnerability in Mbed Mbedtls, classified under CWE-733. CVSS score: 7.8/10. Published 2025-07-04.

How severe is CVE-2025-52496?

High severity. CVSS v3 base score is 7.8 out of 10.

Is CVE-2025-52496 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Mbed Mbedtls

CVE-2025-52496

Mbed TLS before 3.6.4 has a race condition in AESNI detection if certain compiler optimizations occur. An attacker may be able to extract an AES key from a multithreaded program, or perform a GCM forgery.

EPSS: 0.001 (24.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N.

Affected products

Mbed Mbedtls — versions 0

Weakness classification (CWE)

CWE-733

Public proof-of-concept exploits

References

github.com/Mbed-TLS/mbedtls-docs/blob/main/security-advisories/mbedtls-security…

Frequently asked questions

What is CVE-2025-52496?: CVE-2025-52496 is a high-severity vulnerability in Mbed Mbedtls, classified under CWE-733. CVSS score: 7.8/10. Published 2025-07-04.
How severe is CVE-2025-52496?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2025-52496 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.