CVE-2026-121963

EUVD-2026-116963
FreeRDP before 3.32.2 contains a use-after-free vulnerability in the asynchronous dynamic rdpsnd channel that allows malicious RDP servers to trigger freed callback access by closing the channel with queued audio PDUs. Attackers can send a training PDU then close the channel so the playback thread reads the freed callback in rdpsnd_virtual_channel_write, crashing the client.
Race Condition
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
5.9 MEDIUM
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources (CNA/ADP records, vendor advisories, Enginsight analysis).
VendorProductVersionSource
freerdpfreerdp
𝑥
< 3.32.2
CNA
Debian logo
Debian Releases
Debian Product
Codename
freerdp2
bookworm
vulnerable
freerdp3
forky
3.32.2+dfsg-1
fixed
sid
3.33.0+dfsg-1
fixed
trixie
vulnerable
Common Weakness Enumeration
References
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cx9c-q4jc-wm6c
https://www.vulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-dynamic-rdpsnd-channel-close
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cx9c-q4jc-wm6c