What is CVE-2026-121404?

CVE-2026-121404 is a medium-severity vulnerability in Freerdp, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-11-03.

How severe is CVE-2026-121404?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Resource exhaustion in Freerdp

CVE-2026-121404

FreeRDP before 3.32.2 contains a denial of service vulnerability in the shadow server that allows authenticated RDP clients to spin server threads by sending zero-length drdynvc DATA PDUs. Attackers can send empty DATA messages on opened audin or rdpgfx channels, so that FreeRDP_WTSVirtualChannelRead never consumes them, consuming full CPU cores until disconnect.

Vulnerability class: DoS (Denial of Service)

Published 2026-11-03 · last modified 2026-11-03.

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

Freerdp

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

github.com/FreeRDP/FreeRDP/security/advisories/GHSA-fqcj-rwww-2498 (vendor-advisory, Vendor Advisory)
www.vulncheck.com/advisories/freerdp-before-3.32.2-shadow-server-cpu-exhaustion… (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-121404?: CVE-2026-121404 is a medium-severity vulnerability in Freerdp, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-11-03.
How severe is CVE-2026-121404?: Medium severity. CVSS v3 base score is 6.5 out of 10.