{"id":"CVE-2026-66307","revision":"dd160d47081f4892ba9c5b9070b672b6","records":[{"revision":"dd160d47081f4892ba9c5b9070b672b6","observedAt":"2026-11-10T23:21:22.745+00:00","statement":{"source":"cve-program","id":"CVE-2026-66307","aliases":[],"title":"Skype for Business and Lync Denial of Service Vulnerability","description":"Integer underflow (wrap or wraparound) in Skype for Business allows an unauthorized attacker to deny service over a network.","state":0,"publishedAt":"2026-09-08T18:39:44.434+00:00","modifiedAt":"2026-11-10T21:38:33.891+00:00","affected":[{"ecosystem":"Vendor product","name":"Skype for Business Server 2015 CU13","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Microsoft\",\n                    \"product\": \"Skype for Business Server 2015 CU13\",\n                    \"platforms\": [\n                        \"x64-based Systems\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"9319.0\",\n                            \"lessThan\": \"6.0.9319.885\",\n                            \"versionType\": \"custom\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Skype for Business Server 2019 CU8","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Microsoft\",\n                    \"product\": \"Skype for Business Server 2019 CU8\",\n                    \"platforms\": [\n                        \"x64-based Systems\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2046.0\",\n                            \"lessThan\": \"7.0.2046.569\",\n                            \"versionType\": \"custom\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Skype for Business Server Subscription Edition CU1","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Microsoft\",\n                    \"product\": \"Skype for Business Server Subscription Edition CU1\",\n                    \"platforms\": [\n                        \"x64-based Systems\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2046.0\",\n                            \"lessThan\": \"7.0.2046.879\",\n                            \"versionType\": \"custom\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C","score":7.5,"severity":"HIGH"}],"references":["https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66307"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-66307","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-66307","identifiers":["CVE-2026-66307"]},"retained":false,"historicalAffected":[]}],"coverage":[]}