{"id":"CVE-2021-41338","aliases":["EUVD-2021-28367","GHSA-6738-qwp3-v34h"],"status":"published","title":"Windows AppContainer Firewall Rules Security Feature Bypass Vulnerability","description":"Windows AppContainer Firewall Rules Security Feature Bypass Vulnerability","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.03299,"percentile":0.88603,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"published":"2021-10-13T00:27:55Z","modified":"2026-06-17T04:08:22Z","exploits":[{"source":"pocgithub","id":"Mario-Kart-Felix/firewall-cve","title":"Mario-Kart-Felix/firewall-cve","date":"2022-03-22","url":"https://github.com/Mario-Kart-Felix/firewall-cve"}],"products":[{"vendor":"microsoft","product":"windows 10 version 1507"},{"vendor":"microsoft","product":"windows 10 version 1607"},{"vendor":"microsoft","product":"windows 10 version 1809"},{"vendor":"microsoft","product":"windows 10 version 1909"},{"vendor":"microsoft","product":"windows 10 version 2004"},{"vendor":"microsoft","product":"windows 10 version 20h2"},{"vendor":"microsoft","product":"windows 10 version 21h1"},{"vendor":"microsoft","product":"windows 11 version 21h2"},{"vendor":"microsoft","product":"windows server 2016"},{"vendor":"microsoft","product":"windows server 2016 (server core installation)"},{"vendor":"microsoft","product":"windows server 2019"},{"vendor":"microsoft","product":"windows server 2019 (server core installation)"},{"vendor":"microsoft","product":"windows server 2022"},{"vendor":"microsoft","product":"windows server version 2004"},{"vendor":"microsoft","product":"windows server version 20h2"},{"vendor":"microsoft","product":"windows_10"},{"vendor":"microsoft","product":"windows_11"},{"vendor":"microsoft","product":"windows_server_2016"},{"vendor":"microsoft","product":"windows_server_2019"},{"vendor":"microsoft","product":"windows_server_2022"}],"references":[{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41338","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-41338"},{"url":"https://github.com/advisories/GHSA-6738-qwp3-v34h"}],"sources":{"cve":[{"id":"CVE-2021-41338","title":"Windows AppContainer Firewall Rules Security Feature Bypass Vulnerability","description":"Windows AppContainer Firewall Rules Security Feature Bypass Vulnerability","status":"published","published":"2021-10-13T00:27:55Z","modified":"2024-08-04T03:08:32.2Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:32:59.105382Z"}],"euvd":[{"id":"EUVD-2021-28367","description":"Windows AppContainer Firewall Rules Security Feature Bypass Vulnerability","status":"published","published":"2021-10-13T00:27:55Z","modified":"2024-08-04T03:08:32Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-03T03:24:18.226903Z"}],"ghsa":[{"id":"GHSA-6738-qwp3-v34h","title":"Windows AppContainer Firewall Rules Security Feature Bypass Vulnerability","description":"Windows AppContainer Firewall Rules Security Feature Bypass Vulnerability","status":"published","published":"2022-05-24T19:17:28Z","modified":"2023-08-02T00:30:38Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T14:54:43.567376Z"}],"nvd":[{"id":"CVE-2021-41338","description":"Windows AppContainer Firewall Rules Security Feature Bypass Vulnerability","status":"published","published":"2021-10-13T01:15:12.877Z","modified":"2026-06-17T04:08:22.16Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","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:H/A:N","level":"medium","assessor":"secondary"},{"version":"2.0","score":2.1,"vector":"AV:L/AC:L/Au:N/C:N/I:P/A:N","level":"low","assessor":"primary"}],"updated_at":"2026-11-02T14:06:59.689345Z"}]}}