CVE-2026-121961

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{"bugzilla": {"description": "freerdp: FreeRDP: Denial of Service via dynamic channel race condition in proxy", "id": "2567461", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2567461"}, "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 freerdp-proxy DRDYNVC tracker when intercepting the drdynvc channel. A malicious target server can repeatedly send CREATE_REQUEST_PDU for an active channel id, racing front DATA handling to free a borrowed context and crash the proxy process.", "A flaw was found in FreeRDP. A malicious or compromised Remote Desktop Protocol (RDP) server can trigger a race condition by repeatedly requesting the creation of an already active dynamic virtual channel while client data is concurrently processed. This issue leads to a use-after-free condition, allowing the server to crash the proxy process and result in a Denial of Service (DoS)."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, disable dynamic virtual channel interception in freerdp-proxy and restrict target connections to trusted hosts:\n1. Operational Configuration: Ensure the proxy configuration does not specify `Intercept=drdynvc` and do not enable proxy modules that intercept dynamic virtual channels. Without dynamic channel interception enabled, the vulnerable tracker path is not invoked.\n2. Network Access Controls: Restrict outbound proxy traffic exclusively to verified, trusted target RDP servers using network egress firewall rules.\nCaveats: Disabling dynamic channel interception may prevent inspection or custom processing of dynamic virtual channel features. Modifying proxy configurations requires restarting the freerdp-proxy process, which will terminate active client sessions."}, "name": "CVE-2026-121961", "public_date": "2026-11-04T15:33:24Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-121961\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-121961\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qw7w-hhxq-763c\nhttps://www.vulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-drdynvc-tracker-race"], "statement": "This vulnerability is rated Moderate rather than Important because successful exploitation only results in a denial of service and requires a specific, non-default proxy configuration. Under typical Red Hat enterprise deployments, the freerdp-proxy component is not configured to intercept dynamic virtual channels by default. Furthermore, triggering the condition requires routing an active client session to an untrusted or compromised backend RDP server and winning a multi-threaded timing race to terminate the proxy process.", "threat_severity": "Moderate"}

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