{"id":"CVE-2021-31978","aliases":["EUVD-2021-18850","GHSA-9mqr-qv46-7v82"],"status":"published","title":"Microsoft Defender Denial of Service Vulnerability","description":"Microsoft Defender Denial of Service Vulnerability","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.01225,"percentile":0.69199,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-06-08T22:46:40Z","modified":"2026-06-17T03:52:37Z","products":[{"vendor":"microsoft","product":"malware_protection_engine"},{"vendor":"microsoft","product":"microsoft malware protection engine"}],"references":[{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31978","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-31978"},{"url":"https://github.com/advisories/GHSA-9mqr-qv46-7v82"}],"sources":{"cve":[{"id":"CVE-2021-31978","title":"Microsoft Defender Denial of Service Vulnerability","description":"Microsoft Defender Denial of Service Vulnerability","status":"published","published":"2021-06-08T22:46:40Z","modified":"2024-08-03T23:10:31.46Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:33:05.665371Z"}],"euvd":[{"id":"EUVD-2021-18850","description":"Microsoft Defender Denial of Service Vulnerability","status":"published","published":"2021-06-08T22:46:40Z","modified":"2024-08-03T23:10:31Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-03T03:24:37.407491Z"}],"ghsa":[{"id":"GHSA-9mqr-qv46-7v82","title":"Microsoft Defender Denial of Service Vulnerability","description":"Microsoft Defender Denial of Service Vulnerability","status":"published","published":"2022-05-24T19:04:46Z","modified":"2023-08-02T00:30:34Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T14:54:43.567376Z"}],"nvd":[{"id":"CVE-2021-31978","description":"Microsoft Defender Denial of Service Vulnerability","status":"published","published":"2021-06-08T23:15:09.39Z","modified":"2026-06-17T03:52:37.367Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"},{"version":"2.0","score":2.1,"vector":"AV:L/AC:L/Au:N/C:N/I:N/A:P","level":"low","assessor":"primary"}],"updated_at":"2026-11-02T14:06:54.439974Z"}]}}