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.

Category

5.4
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.03%
Third-Party Advisory readthedocs.io
Affected: Mbed mbedtls
Published at:
Updated at:

References

Link Tags
https://github.com/Mbed-TLS/mbedtls/releases release notes
https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-03-1/ third party advisory
https://github.com/Mbed-TLS/mbedtls/issues/466 issue tracking
https://mastodon.social/@bagder/114219540623402700 not applicable

Frequently Asked Questions

What is the severity of CVE-2025-27809?
CVE-2025-27809 has been scored as a medium severity vulnerability.
How to fix CVE-2025-27809?
To fix CVE-2025-27809, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-27809 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-27809 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-27809?
CVE-2025-27809 affects Mbed mbedtls.
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