Denial of Service Vulnerability in FreeRDP Software by FreeRDP
CVE-2026-121401

5.3MEDIUM

Key Information:

Vendor

Freerdp

Status
Freerdp
Vendor
CVE Published:
3 November 2026

What is CVE-2026-121401?

The FreeRDP software prior to version 3.32.2 is vulnerable to a denial of service attack due to improper handling of extended authentication messages by the RD Gateway. Specifically, the vulnerability arises when the 'rdg_process_packet' function processes a PKT_TYPE_EXTENDED_AUTH_MSG without verifying the negotiated mode or authentication context. This flaw allows a malicious actor to send an unauthorized extended-auth packet before tunnel authentication is completed, leading to a potential null-pointer dereference and causing the client application to crash.

Affected Version(s)

FreeRDP 0 < 3.32.2

FreeRDP 3.32.2

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GH...
vendor-advisory
https://www.vulncheck.com/advisories/freerdp-before-3.32....
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Kushalkhemka
mayank-jangid-moon
opensec-intelligence
.