All vulnerabilities
CVE-2026-109952GHSA-qq23-mqmv-pc65

FreeRDP 3.0.0 before 3.32.0 Security Protocol Downgrade via Negotiation Response

FreeRDP FreeRDP
Open in ThreatlineRecord JSON
CVSS
6.0Medium
ExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 16 Oct 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.27%Chance of exploitation activity in the next 30 days, higher than 17% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in3.32.0Fixed versionCVE List
Published13 Oct 2026Updated 16 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 2

  • FreeRDPaffected: 3.0.0 before 3.32.0CVE List
  • FreeRDPunaffected: 3.32.0CVE List

References 2