CVE-2025-52497

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
NISTNIST
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
mitreCNA
4.8 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
CISA-ADPADP
---
---
Base Score
CVSS 3.x
EPSS Score
Percentile: 19%
VendorProductVersion
armmbed_tls
𝑥
< 3.6.4
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
mbedtls
bullseye
vulnerable
bullseye (security)
2.16.9-0.1+deb11u2
fixed
bookworm
vulnerable
forky
3.6.4-2
fixed
sid
3.6.4-2
fixed
trixie
3.6.4-2
fixed
Common Weakness Enumeration
References
https://github.com/Mbed-TLS/mbedtls-docs/blob/main/security-advisories/mbedtls-security-advisory-2025-06-2.md