CVE-2026-121387: FreeRDP 2.0.0 before 3.32.2 contains an out-of-bounds read vulnerability in freerdp_dsp_decode_gsm610 that all

Routine

MEDIUM 4.3UPGRADE

CVE-2026-121387 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 2.0.0 before 3.32.2 contains an out-of-bounds read vulnerability in freerdp_dsp_decode_gsm610 that allows malicious RDP servers to read past audio buffers by sending truncated GSM610 frames. Attackers can negotiate GSM610 on rdpsnd and send a WAVE2 message shorter than a 33- or 32-byte WAV49 frame to crash the client.

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-125
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 21:14 UTCUpdated Record last modified

freerdp freerdp UPGRADE

Affected: >= 2.0.0 and < 3.32.2

Fixed in: 3.32.2

Safe to downgrade to: a release before 2.0.0

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.

3. If no update is available yet, DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison freerdp sudo apt install freerdp=<VERSION_BEFORE_2.0.0> sudo apt-mark hold freerdp

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list freerdp sudo dnf downgrade freerdp-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add freerdp

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Advisories and coverage

Research and news

VulDB Recent Entries: CVE-2026-121387 | FreeRDP up to 3.32.1 Audio Decoder freerdp_dsp_decode_gsm610 out-of-bounds 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-2026-121387?

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

Is CVE-2026-121387 being exploited?

CVE-2026-121387 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-2026-121387 affect?

CVE-2026-121387 affects freerdp. Severity is medium (CVSS 4.3). FreeRDP 2.0.0 before 3.32.2 contains an out-of-bounds read vulnerability in freerdp_dsp_decode_gsm610 that allows malicious RDP servers to read past audio buffers by sending truncated GSM610 frames. Attackers can negotiate GSM610 on rdpsnd

How urgent is CVE-2026-121387?

Priority 15/100. No elevated risk signals yet.

Software pages

WinRM and RDP vulnerabilities

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References

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