{"id":"CVE-2021-4076","aliases":["DEBIAN-CVE-2021-4076","DSA-5025-1","EUVD-2021-33968","GHSA-83f4-c2vq-g2p3","UBUNTU-CVE-2021-4076"],"status":"published","title":"A flaw exists in tang, a network-based cryptographic binding server, which could result in leak...","description":"A flaw exists in tang, a network-based cryptographic binding server, which could result in leak of private keys.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.01564,"percentile":0.75464,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-200"],"published":"2021-12-19T00:00:00Z","modified":"2026-10-23T18:03:38Z","fixes":[{"ecosystem":"Debian:12","package":"tang","fixed_in":["11-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"tang","fixed_in":["11-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"tang","fixed_in":["11-1"],"sources":["osv"]},{"ecosystem":"Debian:11","package":"tang","fixed_in":["8-3+deb11u1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"tang","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"11-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"tang","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"11-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"tang","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"11-1"}]}]},{"source":"osv","ecosystem":"Debian:11","package":"tang","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8-3+deb11u1"}]}],"versions":["8-3"]}],"products":[{"vendor":"microsoft","product":"tang"},{"vendor":"tang_project","product":"tang"}],"references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2029814","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Third Party Advisory","report"]},{"url":"https://github.com/latchset/tang/pull/81","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Patch","Third Party Advisory","fix","report"]},{"url":"https://github.com/latchset/tang/commit/e82459fda10f0630c3414ed2afbc6320bb9ea7c9","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-4076"},{"url":"https://github.com/advisories/GHSA-83f4-c2vq-g2p3"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-4076","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-4076","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-4076","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-4076","description":"A flaw exists in tang, a network-based cryptographic binding server, which could result in leak of private keys.","status":"published","published":"2022-03-02T22:23:33Z","modified":"2024-08-03T17:16:03.537Z","cwes":["CWE-200"],"updated_at":"2026-11-02T14:33:07.697752Z"}],"euvd":[{"id":"EUVD-2021-33968","description":"A flaw exists in tang, a network-based cryptographic binding server, which could result in leak of private keys.","status":"published","published":"2022-03-02T22:23:33Z","modified":"2024-08-03T17:16:03Z","updated_at":"2026-11-03T03:25:10.888157Z"}],"ghsa":[{"id":"GHSA-83f4-c2vq-g2p3","title":"A flaw exists in tang, a network-based cryptographic binding server, which could result in leak...","description":"A flaw exists in tang, a network-based cryptographic binding server, which could result in leak of private keys.","status":"published","published":"2022-03-04T00:00:21Z","modified":"2023-02-03T05:06:22Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T14:53:53.309122Z"}],"nvd":[{"id":"CVE-2021-4076","description":"A flaw exists in tang, a network-based cryptographic binding server, which could result in leak of private keys.","status":"published","published":"2022-03-02T23:15:09.187Z","modified":"2026-06-17T04:18:59.99Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:07:05.198719Z"}],"osv":[{"id":"CVE-2021-4076","description":"A flaw exists in tang, a network-based cryptographic binding server, which could result in leak of private keys.","status":"published","published":"2022-03-02T23:15:09.187Z","modified":"2026-10-20T14:29:23.616235976Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:44:21.249056Z"},{"id":"DEBIAN-CVE-2021-4076","description":"A flaw exists in tang, a network-based cryptographic binding server, which could result in leak of private keys.","status":"published","published":"2022-03-02T23:15:09.187Z","modified":"2026-10-23T18:03:38.462969284Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:45:35.521549Z"},{"id":"UBUNTU-CVE-2021-4076","description":"A flaw exists in tang, a network-based cryptographic binding server, which could result in leak of private keys.","status":"withdrawn","published":"2022-03-02T23:15:00Z","modified":"2025-07-16T08:15:54.834052Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:54:29.220315Z"},{"id":"DSA-5025-1","title":"tang - security update","status":"published","published":"2021-12-19T00:00:00Z","modified":"2026-03-09T02:11:20.608097Z","updated_at":"2026-11-02T15:46:17.543497Z"}]}}