CVE-2025-54764
Publication date 20 October 2025
Last updated 16 January 2026
Ubuntu priority
Description
Mbed TLS before 3.6.5 allows a local timing attack against certain RSA operations, and direct calls to mbedtls_mpi_mod_inv or mbedtls_mpi_gcd.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| mbedtls | 25.10 questing |
Vulnerable
|
| 24.04 LTS noble | Ignored changes too intrusive | |
| 22.04 LTS jammy | Ignored changes too intrusive | |
| 20.04 LTS focal | Ignored changes too intrusive | |
| 18.04 LTS bionic | Ignored changes too intrusive | |
| 16.04 LTS xenial | Ignored changes too intrusive |
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
6.2 · Medium
|
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
References
Other references
- https://www.cve.org/CVERecord?id=CVE-2025-54764
- https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-10-ssbleed-mstep/
- https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/
- https://github.com/Mbed-TLS/mbedtls/compare/8f4779c6fa40374f88404787bebad85cc7e9969b..eb346801263ba4612b5e29633bd55fe18943ca65
- https://github.com/Mbed-TLS/mbedtls/compare/9b54f934588bc373f3c3f5d45b5a3ad0ae003082..99270322ffac3546f813b1069fd6efb667cdce3f
- https://github.com/Mbed-TLS/mbedtls/compare/246d86b941ef2d2bdeabd7035efe7200bc609b91..a08faf90700e46f6aa2a6e3fee8a6a71ddb816ce
- https://github.com/Mbed-TLS/mbedtls/compare/246d86b941ef2d2bdeabd7035efe7200bc609b91..30f073236922fe4e528fdf82eb442babb50516fa