FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains an improper certificate hostname validation vulnerability. The TLS hostname matcher (tls_match_hostname() in libfreerdp/crypto/tls.c) treats a wildcard pattern such as *.example.com as matching any hostname ending in .example.com, so it incorrectly accepts a wildcard certificate for multi-label subdomains like a.b.example.com (which OpenSSL's X509_check_host() rejects). This weakens TLS server authentication under wildcard-certificate conditions.
CVSS Details
- CVSS 4.0 Base Score: 9.3 (CRITICAL)
- CVSS 4.0 Vector: (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)
- CVSS 3.1 Base Score: 4.2
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade freerdp-libs-debuginfoUpgrade freerdp-libsUpgrade freerdp-serverUpgrade freerdp-debuginfoUpgrade freerdp-server-debuginfoUpgrade freerdp-develUpgrade libwinprUpgrade libwinpr-debuginfoUpgrade libwinpr-develUpgrade freerdpUpgrade freerdp-debugsource | Sep 1, 2026 | Aug 1, 2026 |
| Redhat_linux | — | No solution exists | Aug 4, 2026 | Aug 1, 2026 |
| Ubuntu | — | Upgrade freerdp3 | Aug 17, 2026 | Aug 1, 2026 |
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