CVE-2025-27809

low-risk

Published 2025-03-25

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.

Do I need to act?

0.08% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 5.4/10 Medium

NETWORK / HIGH complexity

Affected Products (1)

Mbed Tls

Affected Vendors

Arm

References (4)

Release Notes https://github.com/Mbed-TLS/mbedtls/releases

Third Party Advisory https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-a...

Issue Tracking https://github.com/Mbed-TLS/mbedtls/issues/466

Not Applicable https://mastodon.social/@bagder/114219540623402700

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low-risk

Severity 17/34 · Moderate

Exploitability 0/34 · Minimal

Exposure 5/34 · Minimal