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.
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Affected Vendors & Products
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History
Mon, 21 Sep 2026 12:15:00 +0000
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| Weaknesses | CWE-358 | |
| References |
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| Metrics |
threat_severity
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threat_severity
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Thu, 17 Sep 2026 20:30:00 +0000
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ssvc
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Tue, 15 Sep 2026 15:30:00 +0000
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| Description | 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. | |
| Title | FreeRDP 3.0.0 through 3.30.0 Protocol Negotiation Bypass | |
| First Time appeared |
Freerdp
Freerdp freerdp |
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| Weaknesses | CWE-693 | |
| CPEs | cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Freerdp
Freerdp freerdp |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-09-15T15:18:07.144Z
Updated: 2026-09-17T19:28:33.068Z
Reserved: 2026-09-15T11:07:34.398Z
Link: CVE-2026-91949
Updated: 2026-09-17T19:15:28.847Z
Status : Analyzed
Published: 2026-09-15T16:17:48.653
Modified: 2026-09-24T12:14:46.820
Link: CVE-2026-91949