CVE-2025-52496

EUVD-2025-20081
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.8 HIGH
LOCAL
HIGH
NONE
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
mitreCNA
7.8 HIGH
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 4%
Affected Products (NVD)
VendorProductVersion
armmbed_tls
𝑥
< 3.6.4
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
mbedtls
bookworm
vulnerable
bullseye
vulnerable
bullseye (security)
2.16.9-0.1+deb11u3
fixed
forky
3.6.5-0.1
fixed
sid
3.6.5-0.1
fixed
trixie
3.6.5-0.1~deb13u1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
mbedtls
bionic
needed
focal
needed
jammy
needed
noble
needed
oracular
ignored
plucky
ignored
questing
needed
xenial
needed
Common Weakness Enumeration
References
https://github.com/Mbed-TLS/mbedtls-docs/blob/main/security-advisories/mbedtls-security-advisory-2025-06-1.md
https://lists.debian.org/debian-lts-announce/2025/08/msg00013.html
https://github.com/Mbed-TLS/mbedtls-docs/blob/main/security-advisories/mbedtls-security-advisory-2025-06-1.md