FreeRDP: DoS via WINPR_ASSERT in rts_read_auth_verifier_no_checks_CVE-2026-33952

6 / 10

MEDIUM

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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.

Basic Information

ID CVE-2026-33952

Source GitHub_M

Published Mar 30, 2026 at 21:42

Modified Apr 2, 2026 at 14:11

Affected Product

Vendor FreeRDP

Product FreeRDP

Version < 3.24.2

Affected Versions FreeRDP FreeRDP < 3.24.2

CWE Classification

CWE-617

References

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    "published": "2026-03-30T21:42:00.473Z",
    "modified": "2026-04-02T14:11:49.575Z",
    "type": "cve",
    "title": "FreeRDP: DoS via WINPR_ASSERT in rts_read_auth_verifier_no_checks",
    "source": "GitHub_M",
    "references": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4v4p-9v5x-hc93\nhttps://github.com/FreeRDP/FreeRDP/commit/4ac0b6467d371a1ad47c1f751c5b305e4c068adb",
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