CVE-2026-33952CWE-617

FreeRDP: DoS via WINPR_ASSERT in rts_read_auth_verifier_no_checks

Medium · published March 30, 2026

CVSS v4.0
6.0
EPSS
0%
Percentile
35.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.0 · MEDIUM
Vector
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
EPSS
0.00426 · 35.8th percentile
Weakness
CWE-617 · Reachable Assertion
Published
2026-03-30T21:42Z
EPSS history
Timeline
  • 30 MAR 21:42Z
    FreeRDP: DoS via WINPR_ASSERT in rts_read_auth_verifier_no_checks
    cvelistv5