Vulnerability in Arm Mbed TLS
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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.002 (11.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 11.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Arm Mbed TLS
- Mbed Mbedtls — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/Mbed-TLS/mbedtls-docs/blob/main/security-advisories/mbedtls-security… (Exploit, Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2025-52496?
- CVE-2025-52496 is a high-severity vulnerability in Arm Mbed TLS, 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.