Paper/Archive/CVE-2026-121392

CVE-2026-121392

FreeRDP FreeRDP — FreeRDP before 3.32.2 Certificate Identity Validation Bypass via tls_verify_certificate

CVSS 9.1 (CNA)9.1 / 10 × 3027.3 Not in CISA KEV+300.0 No EPSS score.000 × 200.0 No public exploit+100.0 SSVC exploitation: unknown+100.0

Description · from the CVE record

FreeRDP before 3.32.2 contains an improper certificate validation vulnerability in tls_verify_certificate() that accepts Common Name fallback despite non-matching SAN entries and matches IP literals against DNS strings. Man-in-the-middle attackers holding a certificate from a client-trusted CA can bypass server identity checks to intercept RDP sessions, including keystrokes, clipboard, and screen content.

Affected

ProductAffectedFixed inSource

FreeRDP< 3.32.23.32.2CNA

Scores by source

VulnCheck (CNA)9.1CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

VulnCheck (CNA)7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References

advisorygithub.com/FreeRDP/FreeRDP/security/advisories/GHSA-jq25-3374-4262 writeupvulncheck.com/advisories/freerdp-before-3.32.2-certificate-identity-validation-bypass-via-tls-verify-certificate