| Name | CVE-2025-27810 |
| Description | Mbed TLS before 2.28.10 and 3.x before 3.6.3, in some cases of failed memory allocation or hardware errors, uses uninitialized stack memory to compose the TLS Finished message, potentially leading to authentication bypasses such as replays. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Debian ELTS, 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> (Issue mainly concerns PSA subsystem introduced later, unclear if relevant elsewhere)
https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-03-2/
https://github.com/Mbed-TLS/mbedtls/commit/26f0044ad020dc3c8db1b4001464acaef7dfbd52 (mbedtls-3.6.3)
https://github.com/Mbed-TLS/mbedtls/commit/6070470dfd5c680a59a55bc55299e1a65a6c7049 (mbedtls-2.28.10)