VULNERABILITY INTELLIGENCE

CVE-2026-67294

CVSS score5.9 MEDIUM
EPSS probability0.36%
CISA KEVNot currently listed
Published2026-08-01
Last modified2026-09-11
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Description

FreeRDP before 3.29.0 improperly validates the Extended Key Usage (EKU) purpose of the peer certificate during client-side server TLS authentication. In x509_utils_verify(), when server-purpose (X509_PURPOSE_SSL_SERVER) verification fails, the code falls back to client-purpose and any-purpose verification, so a trusted, hostname-matching certificate valid only for clientAuth can be accepted as the RDP server certificate. In environments relying on EKU separation between client and server certificates, this allows a clientAuth-only certificate issued by a trusted CA to bypass server certificate purpose validation.

Weakness classification

  • disclosure@vulncheck.com: CWE-295

Primary references