CVE-2026-33952

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, an unvalidated auth_length field read from the network triggers a WINPR_ASSERT() failure in rts_read_auth_verifier_no_checks(), causing any FreeRDP client connecting through a malicious RDP Gateway to crash with SIGABRT. This is a pre-authentication denial of service affecting all FreeRDP clients using RPC-over-HTTP gateway transport. The assertion is active in default release builds (WITH_VERBOSE_WINPR_ASSERT=ON). This issue has been patched in version 3.24.2.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/FreeRDP/FreeRDP/commit/4ac0b6467d371a1ad47c1f751c5b305e4c068adb	Patch
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4v4p-9v5x-hc93	Exploit Mitigation Patch Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-03-30 22:16

Updated : 2026-06-17 10:38

NVD link : CVE-2026-33952

Mitre link : CVE-2026-33952

CVE.ORG link : CVE-2026-33952

JSON object : View

Products Affected

freerdp

freerdp

CWE

CWE-617

Reachable Assertion

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Prior to version 3.24.2, an unvalidated auth_length field read from the network triggers a WINPR_ASSERT() failure in rts_read_auth_verifier_no_checks(), causing any FreeRDP client connecting through a malicious RDP Gateway to crash with SIGABRT. This is a pre-authentication denial of service affecting all FreeRDP clients using RPC-over-HTTP gateway transport. The assertion is active in default release builds (WITH_VERBOSE_WINPR_ASSERT=ON). This issue has been patched in version 3.24.2."}, {"lang": "es", "value": "FreeRDP es una implementaci\u00f3n gratuita del Protocolo de Escritorio Remoto. Antes de la versi\u00f3n 3.24.2, un campo auth_length no validado le\u00eddo de la red desencadena un fallo de WINPR_ASSERT() en rts_read_auth_verifier_no_checks(), causando que cualquier cliente FreeRDP que se conecta a trav\u00e9s de una puerta de enlace RDP maliciosa se bloquee con SIGABRT. Esto es una denegaci\u00f3n de servicio de pre-autenticaci\u00f3n que afecta a todos los clientes FreeRDP que utilizan el transporte de puerta de enlace RPC-over-HTTP. La aserci\u00f3n est\u00e1 activa en las compilaciones de lanzamiento predeterminadas (WITH_VERBOSE_WINPR_ASSERT=ON). Este problema ha sido parcheado en la versi\u00f3n 3.24.2."}], "lastModified": "2026-06-17T10:38:21.557", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "03FF152C-C651-4586-8958-1555D9797516", "versionEndExcluding": "3.24.2"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}