CVE-2026-121405: FreeRDP before 3.32.2 fails to cap the OutputBufferLength in serial device-control IRP requests, allowing mali

Q: How do I fix CVE-2026-121405?

freerdp: upgrade to 3.32.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-121405 being exploited?

CVE-2026-121405 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-121405 affect?

CVE-2026-121405 affects freerdp. Severity is medium (CVSS 4.3). 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

Q: How urgent is CVE-2026-121405?

Priority 15/100. No elevated risk signals yet.

Routine

MEDIUM 4.3UPGRADE

CVE-2026-121405 is a medium-severity flaw (CVSS 4.3) affecting freerdp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	n/a
CISA exploited list	No
Weakness	CWE-770
Published	2026-11-03
Last modified	2026-11-03

Publisher (CNA): VulnCheck · Vendor: freerdp

Last updated 2026-11-03 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-11-03 15:17 UTCPublished CVE record published
2026-11-03 18:17 UTCUpdated Record last modified

freerdp freerdp UPGRADE

Affected: < 3.32.2

Fixed in: 3.32.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy freerdp || rpm -q freerdp || freerdp --version

2. UPGRADE to 3.32.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade freerdp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade freerdp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Advisories and coverage

Research and news

VulDB Recent Entries: CVE-2026-121405 | FreeRDP up to 3.32.1 Serial Redirection memory allocation 2026-11-03

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-121405?

freerdp: upgrade to 3.32.2. Exact commands for each OS are on this page.

Is CVE-2026-121405 being exploited?

CVE-2026-121405 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-121405 affect?

CVE-2026-121405 affects freerdp. Severity is medium (CVSS 4.3). 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

How urgent is CVE-2026-121405?

Priority 15/100. No elevated risk signals yet.

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CVE-2026-121397 MEDIUM 4.3 UPGRADE FreeRDP before 3.32.2 contains a heap buffer over-read vulnerability in save_png_to_buffer() that allows malic
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References

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