| Name | CVE-2025-27809 |
| Description | Mbed TLS before 2.28.10 and 3.x before 3.6.3, on the client side, accepts servers that have trusted certificates for arbitrary hostnames unless the TLS client application calls mbedtls_ssl_set_hostname. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1101499 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| mbedtls (PTS) | bullseye | 2.16.9-0.1 | vulnerable |
| bullseye (security) | 2.16.9-0.1+deb11u3 | vulnerable |
| bookworm | 2.28.3-1 | vulnerable |
| forky, sid, trixie | 3.6.4-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| mbedtls | source | (unstable) | 3.6.3-1 | | | 1101499 |
Notes
[bookworm] - mbedtls <no-dsa> (Minor issue)
[bullseye] - mbedtls <ignored> (Too disruptive for rdeps if backported)
https://github.com/Mbed-TLS/mbedtls/issues/466
https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-03-1/
https://github.com/Mbed-TLS/mbedtls/commit/9a9f0c77cfd314b761aaeef7a521565e00019b4a (mbedtls-3.6.3)
https://github.com/Mbed-TLS/mbedtls/commit/c43a9d5576c3f9b9da21454711c104b1f9d73efa (mbedtls-2.28.10)