{"id":"CVE-2026-121404","title":"FreeRDP before 3.32.2 Shadow Server CPU Exhaustion via Zero-Length DVC DATA","summary":"FreeRDP before 3.32.2 contains a denial of service vulnerability in the shadow server that allows authenticated RDP clients to spin server threads by sending zero-length drdynvc DATA PDUs. Attackers can send empty DATA messages on opened…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-400"],"vendor":"FreeRDP","product":"FreeRDP","affected":["FreeRDP < 3.32.2"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-03T17:22:41.442755Z"},"published":"2026-11-03","updated":"2026-11-03","sourceUpdated":"2026-11-03T18:30:55.780Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-121404","references":[{"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-fqcj-rwww-2498","label":"GitHub Security Advisory (GHSA-fqcj-rwww-2498)"},{"url":"https://www.vulncheck.com/advisories/freerdp-before-3.32.2-shadow-server-cpu-exhaustion-via-zero-length-dvc-data","label":"VulnCheck Advisory: FreeRDP before 3.32.2 Shadow Server CPU Exhaustion via Zero-Length DVC DATA"}],"tags":["cve.org"],"epss":0.00383,"epssPercentile":0.32559,"ingestedAt":"2026-11-05T20:33:06.360Z","slug":"CVE-2026-121404","body":"## Overview\n\nFreeRDP before 3.32.2 contains a denial of service vulnerability in the shadow server that allows authenticated RDP clients to spin server threads by sending zero-length drdynvc DATA PDUs. Attackers can send empty DATA messages on opened audin or rdpgfx channels, so that FreeRDP_WTSVirtualChannelRead never consumes them, consuming full CPU cores until disconnect.\n\n## Affected\n\n- `FreeRDP < 3.32.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}