Description
FreeRDP before 3.30.0 contains a server-side authentication bypass in the RDSTLS handshake. When a server is configured with RdstlsSecurity = TRUE, the handshake dispatches inbound PDUs based solely on the attacker-supplied wire pduType without verifying that the received PDU is the one required at the current step. Because the rdpRdstls object is calloc-zeroed, its resultCode defaults to 0 (RDSTLS_RESULT_SUCCESS). An unauthenticated remote client can send a Capabilities PDU instead of the required Authentication Request PDU; rdstls_process_capabilities() returns success without ever setting resultCode, so the server responds with an AUTHRSP carrying resultCode SUCCESS and treats the session as authenticated without evaluating any password, redirection GUID, or auto-reconnect cookie. This affects the released FreeRDP 3.x series (e.g., 3.27.1) and master HEAD; at the time of the advisory no patched version was available.
Published: 2026-08-11
Score: 8.7 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Tue, 11 Aug 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 11 Aug 2026 12:30:00 +0000

Type Values Removed Values Added
Description FreeRDP before 3.30.0 contains a server-side authentication bypass in the RDSTLS handshake. When a server is configured with RdstlsSecurity = TRUE, the handshake dispatches inbound PDUs based solely on the attacker-supplied wire pduType without verifying that the received PDU is the one required at the current step. Because the rdpRdstls object is calloc-zeroed, its resultCode defaults to 0 (RDSTLS_RESULT_SUCCESS). An unauthenticated remote client can send a Capabilities PDU instead of the required Authentication Request PDU; rdstls_process_capabilities() returns success without ever setting resultCode, so the server responds with an AUTHRSP carrying resultCode SUCCESS and treats the session as authenticated without evaluating any password, redirection GUID, or auto-reconnect cookie. This affects the released FreeRDP 3.x series (e.g., 3.27.1) and master HEAD; at the time of the advisory no patched version was available.
Title FreeRDP before 3.30.0 RDSTLS Server Authentication Bypass via PDU-type Confusion
First Time appeared Freerdp
Freerdp freerdp
Weaknesses CWE-287
CPEs cpe:2.3:a:freerdp:freerdp:2.11.8:*:*:*:*:*:*:*
cpe:2.3:a:freerdp:freerdp:3.23.0:*:*:*:*:*:*:*
cpe:2.3:a:freerdp:freerdp:3.24.0:*:*:*:*:*:*:*
cpe:2.3:a:freerdp:freerdp:3.24.1:*:*:*:*:*:*:*
cpe:2.3:a:freerdp:freerdp:3.24.2:*:*:*:*:*:*:*
cpe:2.3:a:freerdp:freerdp:3.25.0:*:*:*:*:*:*:*
cpe:2.3:a:freerdp:freerdp:3.26.0:*:*:*:*:*:*:*
Vendors & Products Freerdp
Freerdp freerdp
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}

Subscriptions

Freerdp Freerdp
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-11T14:57:03.252Z

Reserved: 2026-08-10T13:53:42.482Z

Link: CVE-2026-72746

cve-icon Vulnrichment

Updated: 2026-08-11T14:56:59.009Z

cve-icon NVD

Status : Received

Published: 2026-08-11T13:19:05.520

Modified: 2026-08-11T16:17:36.480

Link: CVE-2026-72746

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses