High severity · published Jul 4, 2025
CVE-2025-52496
Mbed TLS before 3.6.4 has a race condition in AESNI detection if certain compiler optimizations occur
7.8
CVSS
0.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Attack vector
Local
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 12% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MT
Mbed Tls · Arm
before 3.6.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-52496
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-52496
Exploit
https://github.com/Mbed-TLS/mbedtls-docs/blob/main/security-advisories/mbedtls-security-advisory-2025-06-1.md
lists.debian.org
https://lists.debian.org/debian-lts-announce/2025/08/msg00013.html
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