CVE-2026-63117: FreeRDP is a free implementation of the Remote Desktop Protocol

Q: How do I fix CVE-2026-63117?

freerdp: upgrade to 3.28.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-63117 being exploited?

CVE-2026-63117 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-2026-63117 affect?

CVE-2026-63117 affects freerdp. Severity is medium (CVSS 6.5). FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, an authenticated RDP client can advertise DVI ADPCM with nBlockAlign equal to 8 and nChannels equal to 2 to make the `bs` calculation in rdpsnd_server_select_

Q: How urgent is CVE-2026-63117?

Priority 34/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2026-63117 is a medium-severity flaw (CVSS 6.5) affecting freerdp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, an authenticated RDP client can advertise DVI ADPCM with nBlockAlign equal to 8 and nChannels equal to 2 to make the `bs` calculation in rdpsnd_server_select_format in channels/rdpsnd/server/rdpsnd_main.c equal zero. The subsequent out_frames modulo `bs` operation raises SIGFPE and terminates the server-side rdpsnd channel process. This vulnerability fixed in 3.28.0

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-369
Published	2026-08-19
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: freerdp

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-19 18:17 UTCPublished CVE record published
2026-10-26 11:10 UTCUpdated Record last modified

freerdp freerdp UPGRADE

Affected: < 3.28.0

Fixed in: 3.28.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 3.28.0 (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.

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-2026-63117?

freerdp: upgrade to 3.28.0. Exact commands for each OS are on this page.

Is CVE-2026-63117 being exploited?

CVE-2026-63117 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-2026-63117 affect?

CVE-2026-63117 affects freerdp. Severity is medium (CVSS 6.5). FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, an authenticated RDP client can advertise DVI ADPCM with nBlockAlign equal to 8 and nChannels equal to 2 to make the `bs` calculation in rdpsnd_server_select_

How urgent is CVE-2026-63117?

Priority 34/100. No elevated risk signals yet.

Software pages

WinRM and RDP vulnerabilities

Related CVEs

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References

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