CVE-2025-27809 The advisory has been revoked - it doesn't affect any version of package mbedtls (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU2404-MBEDTLS-9512966
- published9 Oct 2025
- disclosed25 Mar 2025
Introduced: 25 Mar 2025
CVE-2025-27809 (opens in a new tab)Amendment
The Ubuntu security team deemed this advisory irrelevant for Ubuntu:24.04.
NVD Description
Note: Versions mentioned in the description apply only to the upstream mbedtls package and not the mbedtls package as distributed by Ubuntu.
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.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2025-27809
- https://github.com/Mbed-TLS/mbedtls/releases
- https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-03-1/
- https://github.com/Mbed-TLS/mbedtls/issues/466
- https://mastodon.social/@bagder/114219540623402700