{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-66308", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "state": "PUBLISHED", "assignerShortName": "microsoft", "dateReserved": "2026-07-24T18:06:51.295Z", "datePublished": "2026-09-08T18:30:36.611Z", "dateUpdated": "2026-09-16T21:50:31.363Z"}, "containers": {"cna": {"title": "Skype for Business and Lync Denial of Service Vulnerability", "datePublic": "2026-09-08T14:00:00.000Z", "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:skype_for_business_server_2015:*:cu13:*:*:*:*:*:*", "versionStartIncluding": "9319.0", "versionEndExcluding": "6.0.9319.885"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:skype_for_business_server_subscription_edition:*:cu1:*:*:*:*:*:*", "versionStartIncluding": "2046.0", "versionEndExcluding": "7.0.2046.879"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:skype_for_business_server_2019:*:cu8:*:*:*:*:*:*", "versionStartIncluding": "2046.0", "versionEndExcluding": "7.0.2046.569"}]}]}], "affected": [{"vendor": "Microsoft", "product": "Skype for Business Server 2015 CU13", "platforms": ["x64-based Systems"], "versions": [{"version": "9319.0", "lessThan": "6.0.9319.885", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Skype for Business Server 2019 CU8", "platforms": ["x64-based Systems"], "versions": [{"version": "2046.0", "lessThan": "7.0.2046.569", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Skype for Business Server Subscription Edition CU1", "platforms": ["x64-based Systems"], "versions": [{"version": "2046.0", "lessThan": "7.0.2046.879", "versionType": "custom", "status": "affected"}]}], "descriptions": [{"value": "Out-of-bounds read in Skype for Business allows an authorized attacker to deny service over a network.", "lang": "en-US"}], "problemTypes": [{"descriptions": [{"description": "CWE-125: Out-of-bounds Read", "lang": "en-US", "type": "CWE", "cweId": "CWE-125"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-09-16T21:50:31.363Z"}, "references": [{"name": "Skype for Business and Lync Denial of Service Vulnerability", "tags": ["vendor-advisory", "patch"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66308"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en-US", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "baseSeverity": "MEDIUM", "baseScore": 6.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C"}}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-08T20:38:50.381700Z", "id": "CVE-2026-66308", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-08T20:45:13.484Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-66308", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-08T20:38:50.381700Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-08T20:45:06.643Z"}}], "cna": {"title": "Skype for Business and Lync Denial of Service Vulnerability", "metrics": [{"format": "CVSS", "cvssV3_1": {"version": "3.1", "baseScore": 6.5, "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C"}, "scenarios": [{"lang": "en-US", "value": "GENERAL"}]}], "affected": [{"vendor": "Microsoft", "product": "Skype for Business Server 2015 CU13", "versions": [{"status": "affected", "version": "9319.0", "lessThan": "6.0.9319.885", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"vendor": "Microsoft", "product": "Skype for Business Server 2019 CU8", "versions": [{"status": "affected", "version": "2046.0", "lessThan": "7.0.2046.569", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"vendor": "Microsoft", "product": "Skype for Business Server Subscription Edition CU1", "versions": [{"status": "affected", "version": "2046.0", "lessThan": "7.0.2046.879", "versionType": "custom"}], "platforms": ["x64-based Systems"]}], "datePublic": "2026-09-08T14:00:00.000Z", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66308", "name": "Skype for Business and Lync Denial of Service Vulnerability", "tags": ["vendor-advisory", "patch"]}], "descriptions": [{"lang": "en-US", "value": "Out-of-bounds read in Skype for Business allows an authorized attacker to deny service over a network."}], "problemTypes": [{"descriptions": [{"lang": "en-US", "type": "CWE", "cweId": "CWE-125", "description": "CWE-125: Out-of-bounds Read"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:skype_for_business_server_2015:*:cu13:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.0.9319.885", "versionStartIncluding": "9319.0"}, {"criteria": "cpe:2.3:a:microsoft:skype_for_business_server_subscription_edition:*:cu1:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.2046.879", "versionStartIncluding": "2046.0"}, {"criteria": "cpe:2.3:a:microsoft:skype_for_business_server_2019:*:cu8:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.2046.569", "versionStartIncluding": "2046.0"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-09-16T21:50:31.363Z"}}}, "cveMetadata": {"cveId": "CVE-2026-66308", "state": "PUBLISHED", "dateUpdated": "2026-09-16T21:50:31.363Z", "dateReserved": "2026-07-24T18:06:51.295Z", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "datePublished": "2026-09-08T18:30:36.611Z", "assignerShortName": "microsoft"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"platforms": ["x64-based Systems"], "product": "Skype for Business Server 2015 CU13", "vendor": "Microsoft", "versions": [{"lessThan": "6.0.9319.885", "status": "affected", "version": "9319.0", "versionType": "custom"}]}, {"platforms": ["x64-based Systems"], "product": "Skype for Business Server 2019 CU8", "vendor": "Microsoft", "versions": [{"lessThan": "7.0.2046.569", "status": "affected", "version": "2046.0", "versionType": "custom"}]}, {"platforms": ["x64-based Systems"], "product": "Skype for Business Server Subscription Edition CU1", "vendor": "Microsoft", "versions": [{"lessThan": "7.0.2046.879", "status": "affected", "version": "2046.0", "versionType": "custom"}]}], "source": "secure@microsoft.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:skype_for_business_server:2015:cumulative_update_13:*:*:*:*:*:*", "matchCriteriaId": "590D1547-C998-4BDD-BE06-379099E2D9C7", "vulnerable": true}, {"criteria": "cpe:2.3:a:microsoft:skype_for_business_server:2015:cumulative_update_13_hotfix_2:*:*:*:*:*:*", "matchCriteriaId": "D7B2DE75-E220-447A-90F6-D077E611945B", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_8:*:*:*:*:*:*", "matchCriteriaId": "85821F4F-AC9B-4D9E-84A4-A57D842B0D5E", "vulnerable": true}, {"criteria": "cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_8_hotfix1:*:*:*:*:*:*", "matchCriteriaId": "8545EA2E-796F-4458-B996-5B907E7927EF", "vulnerable": true}, {"criteria": "cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_8_hotfix2:*:*:*:*:*:*", "matchCriteriaId": "96E5BC34-2C62-4F15-AA4F-765F596C7445", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:skype_for_business_server_subscription_edition:7.0.2046.849:*:*:*:*:*:*:*", "matchCriteriaId": "15BD78C6-A65A-4CD6-A91F-CA2876AD848C", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Out-of-bounds read in Skype for Business allows an authorized attacker to deny service over a network."}], "id": "CVE-2026-66308", "lastModified": "2026-09-16T19:25:08.633", "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": "secure@microsoft.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-66308", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-08T20:38:50.381700Z", "version": "2.0.3"}}]}, "published": "2026-09-08T19:18:08.450", "references": [{"source": "secure@microsoft.com", "tags": ["Patch", "Vendor Advisory"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66308"}], "sourceIdentifier": "secure@microsoft.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "secure@microsoft.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[9319.0,6.0.9319.885)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "inferred", "scores": [{"score": 100.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Skype for Business Server 2015 CU13", "source": "cna", "vendor": "Microsoft"}, "product": "skype_for_business_server_2015", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[2046.0,7.0.2046.569)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "inferred", "scores": [{"score": 100.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Skype for Business Server 2019 CU8", "source": "cna", "vendor": "Microsoft"}, "product": "skype_for_business_server_2019", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[2046.0,7.0.2046.879)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "inferred", "scores": [{"score": 100.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Skype for Business Server Subscription Edition CU1", "source": "cna", "vendor": "Microsoft"}, "product": "skype_for_business_server_subscription_edition", "vendor": "microsoft"}], "created": "2026-09-09T15:30:08.690331+00:00", "updated": "2026-09-11T16:30:07.801542+00:00", "vendors": ["microsoft", "microsoft$PRODUCT$skype_for_business_server_2015", "microsoft$PRODUCT$skype_for_business_server_2019", "microsoft$PRODUCT$skype_for_business_server_subscription_edition"]}