CVE-2026-109952

FreeRDP 3.0.0 before 3.32.0 Security Protocol Downgrade via Negotiation Response

State: Published
Severity: 6.0 Medium
Published: Oct 13, 2026
Updated: Oct 16, 2026
Reserved: Oct 13, 2026

Description

The FreeRDP client 3.0.0 before 3.32.0 does not check a server-selected PROTOCOL_RDSTLS or PROTOCOL_HYBRID_EX against its enabled protocol set in nego_process_negotiation_response(), allowing a security protocol downgrade. A malicious server or man-in-the-middle can select RDSTLS to override /sec:nla pinning, complete authentication with an all-zero cookie, and receive the user's cleartext password in the Client Info PDU.

Scores

CVSS	Score	Vector	Source
4.0	6.0 Medium	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	VulnCheck
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N	VulnCheck

Weaknesses

CWE-757 Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')

Affected Products

Product	Versions
FreeRDPFreeRDP	3.0.0 to before 3.32.0Affected 3.32.0Not affected

References

GitHub Security Advisory (GHSA-qq23-mqmv-pc65)vendor-advisory
VulnCheck Advisory: FreeRDP 3.0.0 before 3.32.0 Security Protocol Downgrade via Negotiation Responsethird-party-advisory

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