CVE-2026-91949
FreeRDP 3.0.0 through 3.30.0 Protocol Negotiation Bypass
CVSS Score
9.3
EPSS Score
0.0%
EPSS Percentile
0th
FreeRDP server versions before 3.31.0 contain a protocol negotiation bypass vulnerability that allows unauthenticated attackers to establish RDSTLS connections despite server policy disabling them. Attackers can send incompatible protocol requests, receive negotiation failures, then complete TLS handshake and enter RDSTLS to bypass pre-authentication transport restrictions.
| CWE | CWE-693 |
| Vendor | freerdp |
| Product | freerdp |
| Published | Sep 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
Low
Availability
None
Affected Versions
FreeRDP / FreeRDP
3.0.0 < 3.31.0
References
Credits
🔍 sam4k