Null Pointer Vulnerability in FreeRDP Affects ARM Gateway Response Parsing
CVE-2026-121390

5.3MEDIUM

Key Information:

Vendor

Freerdp

Status
Freerdp
Vendor
CVE Published:
3 November 2026

What is CVE-2026-121390?

FreeRDP versions before 3.32.2, particularly built with the WITH_AAD=ON option, are susceptible to a reachable assertion due to inadequate validation in the ARM gateway response parser. This vulnerability allows for the acceptance of a malformed or missing 'redirectedServerCert' field, which leads to a null buffer being processed by the certificate parser. An attacker can exploit this by manipulating the user-selected gateway to return an inappropriate response, ultimately causing a crash in the client process.

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-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

opensec-intelligence
Kushalkhemka
mayank-jangid-moon
.