Vulnerability in Freerdp
CVE-2026-121409
FreeRDP before 3.32.2 contains a denial of service vulnerability that allows malicious servers or unauthenticated peers to abort clients or proxies via oversized X.224 routing tokens. Attackers can send an oversized LoadBalanceInfo in a Server Redirection PDU, or a 240–247 byte token to a FixedTarget freerdp-proxy, triggering a tpdu_write_header assertion that crashes the process.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
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-3hf9-w6hr-hf9j (vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/freerdp-before-3.32.2-denial-of-service-via-oversi… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-121409?
- CVE-2026-121409 is a medium-severity vulnerability in Freerdp, classified under Reachable Assertion. CVSS score: 5.9/10. Published 2026-11-03.
- How severe is CVE-2026-121409?
- Medium severity. CVSS v3 base score is 5.9 out of 10.