CVE-2026-121963

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{"bugzilla": {"description": "freerdp: freerdp: Denial of Service via dynamic audio channel use-after-free", "id": "2567464", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2567464"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["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.", "A flaw was found in FreeRDP. This vulnerability allows a malicious Remote Desktop Protocol (RDP) server to cause a Denial of Service (DoS) by crashing the client application. By sending audio data packets over a dynamic virtual channel and immediately closing the connection, the server triggers a use-after-free condition where the client's audio playback thread accesses already released memory."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-121963", "public_date": "2026-11-04T15:33:25Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-121963\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-121963\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cx9c-q4jc-wm6c\nhttps://www.vulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-dynamic-rdpsnd-channel-close"], "statement": "This vulnerability is rated as Moderate impact because successful exploitation requires connecting to an untrusted or compromised remote host and results strictly in a client application crash without compromising confidentiality or integrity. In typical enterprise environments, RDP sessions are established with known, managed systems, substantially limiting exposure to rogue servers. Furthermore, the flaw only impacts client sessions handling audio redirection over dynamic channels, and the blast radius is confined to the individual client process.", "threat_severity": "Moderate"}

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