Improper input validation in Freerdp
CVE-2026-121407
FreeRDP before 3.32.2 contains a denial of service vulnerability in the shadow server's remdesk_server_thread that allows authenticated clients to crash the process via an inverted PDU length check. Attackers can send an 8192-byte remdesk payload declaring an eight-byte PDU length to trigger a fatal Stream_Seek assertion, aborting the server and dropping sessions.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/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-x8vp-ff7m-294g (vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/freerdp-before-3.32.2-shadow-server-denial-of-serv… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-121407?
- CVE-2026-121407 is a medium-severity vulnerability in Freerdp, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2026-11-03.
- How severe is CVE-2026-121407?
- Medium severity. CVSS v3 base score is 6.5 out of 10.