NULL pointer dereference in Freerdp
CVE-2026-121401
FreeRDP before 3.32.2 contains a denial of service vulnerability where rdg_process_packet dispatches a PKT_TYPE_EXTENDED_AUTH_MSG without verifying negotiated mode or auth context. A malicious or compromised RD Gateway can send the extended-auth packet before tunnel authentication, triggering a null-pointer dereference that crashes the client.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8rjm-m7xg-mg6m (vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/freerdp-before-3.32.2-denial-of-service-via-rd-gat… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-121401?
- CVE-2026-121401 is a medium-severity vulnerability in Freerdp, classified under NULL Pointer Dereference. CVSS score: 4.3/10. Published 2026-11-03.
- How severe is CVE-2026-121401?
- Medium severity. CVSS v3 base score is 4.3 out of 10.