{"id":"CVE-2021-26421","aliases":["EUVD-2021-13227","GHSA-w6mv-8x3w-r7w5"],"status":"published","title":"Skype for Business and Lync Spoofing Vulnerability","description":"Skype for Business and Lync Spoofing Vulnerability","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.01411,"percentile":0.72858,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-05-11T19:11:12Z","modified":"2026-06-17T03:43:22Z","products":[{"vendor":"microsoft","product":"lync_server"},{"vendor":"microsoft","product":"microsoft lync server 2013 cu10"},{"vendor":"microsoft","product":"skype for business server 2015 cu11"},{"vendor":"microsoft","product":"skype_for_business_server"}],"references":[{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26421","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26421"},{"url":"https://github.com/advisories/GHSA-w6mv-8x3w-r7w5"}],"sources":{"cve":[{"id":"CVE-2021-26421","title":"Skype for Business and Lync Spoofing Vulnerability","description":"Skype for Business and Lync Spoofing Vulnerability","status":"published","published":"2021-05-11T19:11:12Z","modified":"2024-08-03T20:26:25.289Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:32:57.033395Z"}],"euvd":[{"id":"EUVD-2021-13227","description":"Skype for Business and Lync Spoofing Vulnerability","status":"published","published":"2021-05-11T19:11:12Z","modified":"2024-08-03T20:26:25Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N/E:U/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-03T03:24:51.962182Z"}],"ghsa":[{"id":"GHSA-w6mv-8x3w-r7w5","title":"Skype for Business and Lync Spoofing Vulnerability","description":"Skype for Business and Lync Spoofing Vulnerability","status":"published","published":"2022-05-24T19:02:04Z","modified":"2023-08-02T00:30:30Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T14:54:43.567376Z"}],"nvd":[{"id":"CVE-2021-26421","description":"Skype for Business and Lync Spoofing Vulnerability","status":"published","published":"2021-05-11T19:15:08.87Z","modified":"2026-06-17T03:43:22.813Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N","level":"high","assessor":"secondary"},{"version":"2.0","score":5.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:N","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:53.343329Z"}]}}