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CVE-2026-33952

FreeRDP: DoS via WINPR_ASSERT in rts_read_auth_verifier_no_checks

Published: Mar 30, 2026Updated: Apr 2, 2026 Sources: CVE List NVD BDUCWE-617
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.3%
Top 81.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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 Vector Breakdown

AV:NAC:LPR:NUI:RS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-617

Affected Products

FreeRDPFreeRDPOSS Libraries
АЛЬТ СП 10АО «ИВК»
On-premOS
Operating Systems / linux-distro
FreeRDPFree Software Foundation, Inc.OSS Libraries
freerdpfreerdpOSS Libraries
freerdposs-projectUSOSS Libraries
ао «ивк»commercialRUOperating Systemsaka ivk
free software foundation, inc.oss-projectUSOSS Librariesaka fsf, free software foundation

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4v4p-9v5x-hc93
github.com
https://github.com/FreeRDP/FreeRDP/commit/4ac0b6467d371a1ad47c1f751c5b305e4c068adb
github.com
https://altsp.su/obnovleniya-bezopasnosti/
altsp.su

Timeline

Published
Mar 30, 2026
Last Updated
Apr 2, 2026

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