CVE-2025-52497

EUVD-2025-20082
Mbed TLS before 3.6.4 has a PEM parsing one-byte heap-based buffer underflow, in mbedtls_pem_read_buffer and two mbedtls_pk_parse functions, via untrusted PEM input.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
mitreCNA
4.8 MEDIUM
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: 20.23%
Affected Products (NVD)
VendorProductVersion
armmbed_tls
𝑥
< 3.6.4
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
mbedmbedtls
𝑥
< 3.6.4
CNA
Debian logo
Debian Releases
Debian Product
Codename
mbedtls
bookworm
vulnerable
bullseye
vulnerable
bullseye (security)
2.16.9-0.1+deb11u4
fixed
forky
3.6.7-3
fixed
sid
3.6.7-3
fixed
trixie
3.6.5-0.1~deb13u1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
mbedtls
bionic
Fixed 2.8.0-1ubuntu0.1~esm1
released
focal
Fixed 2.16.4-1ubuntu2+esm1
released
jammy
Fixed 2.28.0-1ubuntu0.1~esm1
released
noble
Fixed 2.28.8-1ubuntu0.1~esm1
released
oracular
ignored
plucky
ignored
questing
ignored
resolute
not-affected
xenial
ignored
Common Weakness Enumeration
References
https://github.com/Mbed-TLS/mbedtls-docs/blob/main/security-advisories/mbedtls-security-advisory-2025-06-2.md
https://lists.debian.org/debian-lts-announce/2025/08/msg00013.html