{"id":"CVE-2021-34451","aliases":["EUVD-2021-21106","GHSA-pvgh-q9cp-r848"],"status":"published","title":"Microsoft Office Online Server Spoofing Vulnerability","description":"Microsoft Office Online Server Spoofing Vulnerability","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.01784,"percentile":0.78482,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-07-16T20:19:42Z","modified":"2026-08-10T18:30:49Z","products":[{"vendor":"microsoft","product":"microsoft office online server"},{"vendor":"microsoft","product":"office_online_server"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34451","tags":["vendor-advisory","patch"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34451","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-34451"},{"url":"https://github.com/advisories/GHSA-pvgh-q9cp-r848"}],"sources":{"cve":[{"id":"CVE-2021-34451","title":"Microsoft Office Online Server Spoofing Vulnerability","description":"Microsoft Office Online Server Spoofing Vulnerability","status":"published","published":"2021-07-16T20:19:42Z","modified":"2026-08-10T15:11:48.843Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:33:11.244759Z"}],"euvd":[{"id":"EUVD-2021-21106","description":"Microsoft Office Online Server Spoofing Vulnerability","status":"published","published":"2021-07-16T20:19:42Z","modified":"2026-08-10T15:11:48Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-02T18:02:03.704262Z"}],"ghsa":[{"id":"GHSA-pvgh-q9cp-r848","title":"Microsoft Office Online Server Spoofing Vulnerability","description":"Microsoft Office Online Server Spoofing Vulnerability","status":"published","published":"2022-05-24T19:08:16Z","modified":"2026-08-10T18:30:49Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:10:14.704025Z"}],"nvd":[{"id":"CVE-2021-34451","description":"Microsoft Office Online Server Spoofing Vulnerability","status":"published","published":"2021-07-16T21:15:09.677Z","modified":"2026-08-10T16:17:46.047Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:55.747384Z"}]}}