CVE-2026-63117

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{"affected": [{"affectedData": [{"product": "FreeRDP", "vendor": "FreeRDP", "versions": [{"status": "affected", "version": "< 3.28.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*", "matchCriteriaId": "A8B55819-E57A-4BF4-87DF-357FBF92006F", "versionEndExcluding": "3.28.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "FreeRDP es una implementaci\u00f3n gratuita del Protocolo de Escritorio Remoto. Antes de 3.28.0, un cliente RDP autenticado puede anunciar DVI ADPCM con nBlockAlign igual a 8 y nChannels igual a 2 para hacer que el c\u00e1lculo de \u2019bs\u2019 en rdpsnd_server_select_format en channels/rdpsnd/server/rdpsnd_main.c sea igual a cero. La operaci\u00f3n subsiguiente de out_frames m\u00f3dulo \u2019bs\u2019 genera SIGFPE y termina el proceso del canal rdpsnd del lado del servidor. Esta vulnerabilidad corregida en 3.28.0."}], "id": "CVE-2026-63117", "lastModified": "2026-10-26T11:10:00.157", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-63117", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-19T18:46:51.410512Z", "version": "2.0.3"}}]}, "published": "2026-08-19T18:17:08.430", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/FreeRDP/FreeRDP/commit/b78fc0b138fe8f08a8b102e193ffb32986f4449a"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/FreeRDP/FreeRDP/pull/12980"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/FreeRDP/FreeRDP/releases/tag/3.28.0"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-v64m-xxfw-hrv6"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-369"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "FreeRDP: FreeRDP: Denial of Service via ADPCM frame size calculation", "id": "2519821", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2519821"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-369", "details": ["A flaw was found in FreeRDP, a free implementation of the Remote Desktop Protocol. An authenticated Remote Desktop Protocol (RDP) client can trigger a denial of service by sending a specially crafted DVI ADPCM frame. By advertising specific nBlockAlign and nChannels values, a division-by-zero error occurs in the rdpsnd_server_select_format function. This vulnerability leads to the termination of the server-side rdpsnd channel process, causing a denial of service."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, administrators can disable audio redirection on the FreeRDP server configuration if remote audio support is not strictly required."}, "name": "CVE-2026-63117", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-19T17:55:39Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63117\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63117\nhttps://github.com/FreeRDP/FreeRDP/commit/b78fc0b138fe8f08a8b102e193ffb32986f4449a\nhttps://github.com/FreeRDP/FreeRDP/pull/12980\nhttps://github.com/FreeRDP/FreeRDP/releases/tag/3.28.0\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-v64m-xxfw-hrv6"], "statement": "A divide-by-zero flaw was found in FreeRDP's `rdpsnd` audio channel server implementation. An authenticated remote RDP client can send malformed DVI ADPCM audio parameters (`nBlockAlign=8`, `nChannels=2`) during format selection in `rdpsnd_server_select_format`. This triggers an unhandled `SIGFPE` signal when calculating audio frames, crashing the server-side `rdpsnd` process and resulting in a denial of service for remote desktop audio capabilities.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.28.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "FreeRDP", "source": "cna", "vendor": "FreeRDP"}, "product": "freerdp", "vendor": "freerdp"}], "created": "2026-08-19T19:45:03.959095+00:00", "updated": "2026-08-20T13:15:03.502253+00:00", "vendors": ["freerdp", "freerdp$PRODUCT$freerdp"]}