8.7 High

CVE-2026-121960 FreeRDP before 3.32.2 Unauthenticated Denial of Service via CredSSP TSRequest

Description

FreeRDP before 3.32.2 contains a denial of service vulnerability in the NLA-enabled shadow server when a CredSSP TSRequest omits negoTokens. Unauthenticated attackers can send a crafted seven-byte TSRequest containing only the version field to trigger a fatal WINPR_ASSERT and abort the server process.

CVSS 4.0 detail

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

Exploitable remotely over the network, without an account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector: Network
Attack complexity: Low
Attack requirements: None
Privileges required: None
Interaction: None
Confidentiality: None
Integrity: None
Availability: High
Confidentiality of other systems: None
Integrity of other systems: None
Availability of other systems: None

Affected products and versions

Product	Affected versions	Fixed in
FreeRDP 3.32	earliest → < 3.32.2	3.32.2

References

GitHub Security Advisory (GHSA-3pg4-5r42-wxvj) github.com
VulnCheck Advisory: FreeRDP before 3.32.2 Unauthenticated Denial of Service via CredSSP TSRequest www.vulncheck.com

Timeline

Published November 4, 2026
Last modified November 4, 2026

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