CVE-2026-121392: FreeRDP before 3.32.2 contains an improper certificate validation vulnerability in tls_verify_certificate() th

Q: How do I fix CVE-2026-121392?

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

Q: Is CVE-2026-121392 being exploited?

CVE-2026-121392 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-2026-121392 affect?

CVE-2026-121392 affects freerdp. Severity is high (CVSS 7.4). FreeRDP before 3.32.2 contains an improper certificate validation vulnerability in tls_verify_certificate() that accepts Common Name fallback despite non-matching SAN entries and matches IP literals against DNS strings. Man-in-the-middle at

Q: How urgent is CVE-2026-121392?

Priority 31/100. High severity; Remotely exploitable, no login, no user action

Routine

HIGH 7.4REMOTEUPGRADE

CVE-2026-121392 is a high-severity flaw (CVSS 7.4) 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 contains an improper certificate validation vulnerability in tls_verify_certificate() that accepts Common Name fallback despite non-matching SAN entries and matches IP literals against DNS strings. Man-in-the-middle attackers holding a certificate from a client-trusted CA can bypass server identity checks to intercept RDP sessions, including keystrokes, clipboard, and screen content.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.4 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	n/a
CISA exploited list	No
Weakness	CWE-295
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 21:12 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-2026-121392 | FreeRDP up to 3.32.1 tls_verify_certificate certificate validation 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-2026-121392?

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

Is CVE-2026-121392 being exploited?

CVE-2026-121392 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-2026-121392 affect?

CVE-2026-121392 affects freerdp. Severity is high (CVSS 7.4). FreeRDP before 3.32.2 contains an improper certificate validation vulnerability in tls_verify_certificate() that accepts Common Name fallback despite non-matching SAN entries and matches IP literals against DNS strings. Man-in-the-middle at

How urgent is CVE-2026-121392?

Priority 31/100. High severity; Remotely exploitable, no login, no user action

Software pages

WinRM and RDP vulnerabilities

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References

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