{"id":"CVE-2021-24099","aliases":["EUVD-2021-11015","GHSA-gr3f-8f43-4w8g"],"status":"published","title":"Skype for Business and Lync Denial of Service Vulnerability","description":"Skype for Business and Lync Denial of Service Vulnerability","severity":{"version":"3.1","score":6.5,"vector":"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.03201,"percentile":0.88237,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-02-25T23:01:51Z","modified":"2026-06-17T03:39:17Z","products":[{"vendor":"microsoft","product":"lync_server"},{"vendor":"microsoft","product":"microsoft lync server 2013"},{"vendor":"microsoft","product":"skype for business server 2015 cu 8"},{"vendor":"microsoft","product":"skype for business server 2019  cu2"},{"vendor":"microsoft","product":"skype_for_business_server"}],"references":[{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24099","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-24099"},{"url":"https://github.com/advisories/GHSA-gr3f-8f43-4w8g"}],"sources":{"cve":[{"id":"CVE-2021-24099","title":"Skype for Business and Lync Denial of Service Vulnerability","description":"Skype for Business and Lync Denial of Service Vulnerability","status":"published","published":"2021-02-25T23:01:51Z","modified":"2024-08-03T19:21:18.288Z","cvss":[{"version":"3.1","score":6.5,"vector":"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","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:33:05.000797Z"}],"euvd":[{"id":"EUVD-2021-11015","description":"Skype for Business and Lync Denial of Service Vulnerability","status":"published","published":"2021-02-25T23:01:51Z","modified":"2024-08-03T19:21:18Z","cvss":[{"version":"3.1","score":6.5,"vector":"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","level":"medium"}],"updated_at":"2026-11-03T03:24:59.661237Z"}],"ghsa":[{"id":"GHSA-gr3f-8f43-4w8g","title":"Skype for Business and Lync Denial of Service Vulnerability","description":"Skype for Business and Lync Denial of Service Vulnerability","status":"published","published":"2022-05-24T17:43:18Z","modified":"2023-12-29T18:30:27Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T14:55:18.128107Z"}],"nvd":[{"id":"CVE-2021-24099","description":"Skype for Business and Lync Denial of Service Vulnerability","status":"published","published":"2021-02-25T23:15:15.977Z","modified":"2026-06-17T03:39:17.48Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:50.399901Z"}]}}