Denial-of-Service Vulnerability in FreeRDP by FreeRDP
CVE-2026-121400

7.1HIGH

Key Information:

Vendor

Freerdp

Status
Freerdp
Vendor
CVE Published:
3 November 2026

What is CVE-2026-121400?

FreeRDP versions prior to 3.32.2 are susceptible to a denial-of-service vulnerability affecting the rdg_process_control_packet function. An attacker can exploit this issue by sending an incomplete keepalive control packet via a malicious RD Gateway. This vulnerability allows for an unbounded read loop, causing a single thread on the client to consume 100% CPU resources, thereby impacting system performance significantly.

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:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
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
.