Denial of Service in FreeRDP Clients by FreeRDP
CVE-2026-121396

5.3MEDIUM

Key Information:

Vendor

Freerdp

Status
Freerdp
Vendor
CVE Published:
3 November 2026

What is CVE-2026-121396?

FreeRDP clients prior to version 3.32.2 possess a vulnerability that can be exploited by attackers controlling an RD Gateway. By sending a crafted RPC-over-HTTP RTS PDU with improperly formatted authentication padding, malicious actors can trigger a reachable assertion in the rts_read_auth_verifier function. This can lead to the premature termination of the connecting client process, causing a denial of service. Users of affected versions are encouraged to upgrade to the latest version to mitigate this risk.

Affected Version(s)

FreeRDP 3.0.0 < 3.32.2

FreeRDP 3.32.2

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GH...
vendor-advisory
https://www.vulncheck.com/advisories/freerdp-3.0.0-before...
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
skigeek16
opensec-intelligence
.