What is CVE-2026-121405?

CVE-2026-121405 is a medium-severity vulnerability in Freerdp, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 4.3/10. Published 2026-11-03.

How severe is CVE-2026-121405?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Resource exhaustion in Freerdp

CVE-2026-121405

FreeRDP before 3.32.2 fails to cap the OutputBufferLength in serial device-control IRP requests, allowing malicious servers to trigger excessive memory allocation. Attackers running a server with serial redirection can send an IRP_MJ_DEVICE_CONTROL request with IOCTL_USBPRINT_GET_1284_ID and a near-maximum length to exhaust client memory.

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

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

Freerdp

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

github.com/FreeRDP/FreeRDP/security/advisories/GHSA-r387-jjq3-87hv (vendor-advisory, Vendor Advisory)
www.vulncheck.com/advisories/freerdp-before-3.32.2-memory-exhaustion-via-serial… (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-121405?: CVE-2026-121405 is a medium-severity vulnerability in Freerdp, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 4.3/10. Published 2026-11-03.
How severe is CVE-2026-121405?: Medium severity. CVSS v3 base score is 4.3 out of 10.