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Fencer Intel
medium 5.9

CVE-2026-121409 json

FreeRDP before 3.32.2 Denial of Service via Oversized X.224 Routing Token

published 6d ago modified 6d ago also EUVD-2026-115941

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 26%
public exploits
0
none known

Summary

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.

Patch / fix

  • FreeRDP FreeRDP 3.32.2
  • freerdp3 Debian 14 3.32.2+dfsg-1

debian advisories DEBIAN-CVE-2026-121409

  • freerdp3 Ubuntu 24.04 LTS 3.32.2+dfsg-0ubuntu0.24.04.1
  • freerdp3 Ubuntu 26.10 3.32.2+dfsg-0ubuntu0.26.10.1
  • freerdp3 Ubuntu 26.04 LTS 3.32.2+dfsg-0ubuntu0.26.04.1

ubuntu advisories UBUNTU-CVE-2026-121409

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2026-121409 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-121409 updated cvss 5.9

freerdp: freerdp: Denial of Service via oversized X.224 routing token

  • Red Hat Enterprise Linux 6 freerdp, freerdp-libs, freerdp-plugins, freerdp 3.28.0-4.el10_3
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 freerdp, libwinpr, freerdp-libs, freerdp-plugins, freerdp 3.28.0-4.el10_3 Red Hat Enterprise Linux 8 freerdp, libwinpr, freerdp-libs, freerdp 3.28.0-4.el10_3 Red Hat Enterprise Linux 9 freerdp, libwinpr, freerdp-libs, freerdp 3.28.0-4.el10_3 Red Hat Enterprise Linux 10 freerdp 3.28.0-4.el10_3
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
6d ago

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 4.0 8.2 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 4.0 8.2 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • FreeRDP FreeRDP

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.