CVE-2025-27809
MEDIUMCVSS 5.4/10EPSS 0.18%
Last modified
CVE-2025-27809 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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.. EPSS estimates a 0.18% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Arm | Mbed Tls | < 2.28.10 |
| Trustedfirmware | Mbed Tls | >= 3.0.0, < 3.6.3 |
References
- https://github.com/Mbed-TLS/mbedtls/releasesRelease Notes
- https://github.com/Mbed-TLS/mbedtls/issues/466Issue Tracking
- https://mastodon.social/@bagder/114219540623402700Not Applicable
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2025-27809?
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.
How severe is CVE-2025-27809?
CVE-2025-27809 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.
How do I fix CVE-2025-27809?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2025-27809?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST