{"id":"CVE-2021-43521","aliases":["EUVD-2021-30450","GHSA-xhvg-qmw2-rr5r","OESA-2022-1652"],"status":"published","title":"A Buffer Overflow vulnerability exists in zlog 1.2.15 via zlog_conf_build_with_file in src/zlog...","description":"A Buffer Overflow vulnerability exists in zlog 1.2.15 via zlog_conf_build_with_file in src/zlog/src/conf.c.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.01282,"percentile":0.70449,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-787"],"published":"2022-04-08T15:56:29Z","modified":"2026-10-20T10:54:09Z","fixes":[{"ecosystem":"openEuler:20.03-LTS-SP3","package":"zlog","fixed_in":["1.2.15-3.oe1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"openEuler:20.03-LTS-SP3","package":"zlog","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.15-3.oe1"}]}]}],"products":[{"vendor":"zlog_project","product":"zlog"}],"references":[{"url":"https://github.com/HardySimpson/zlog","tags":["x_refsource_MISC","x_transferred","Product","Third Party Advisory","package"]},{"url":"https://github.com/HardySimpson/zlog/issues/206","tags":["x_refsource_MISC","x_transferred","Exploit","Issue Tracking","Third Party Advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43521","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-xhvg-qmw2-rr5r"},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2022-1652","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2021-43521","description":"A Buffer Overflow vulnerability exists in zlog 1.2.15 via zlog_conf_build_with_file in src/zlog/src/conf.c.","status":"published","published":"2022-04-08T15:56:29Z","modified":"2024-08-04T03:55:29.265Z","updated_at":"2026-11-02T14:32:56.689433Z"}],"euvd":[{"id":"EUVD-2021-30450","description":"A Buffer Overflow vulnerability exists in zlog 1.2.15 via zlog_conf_build_with_file in src/zlog/src/conf.c.","status":"published","published":"2022-04-08T15:56:29Z","modified":"2024-08-04T03:55:29Z","updated_at":"2026-11-03T03:24:13.772922Z"}],"ghsa":[{"id":"GHSA-xhvg-qmw2-rr5r","title":"A Buffer Overflow vulnerability exists in zlog 1.2.15 via zlog_conf_build_with_file in src/zlog...","description":"A Buffer Overflow vulnerability exists in zlog 1.2.15 via zlog_conf_build_with_file in src/zlog/src/conf.c.","status":"published","published":"2022-04-09T00:00:26Z","modified":"2023-01-27T05:01:24Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:41:53.158957Z"}],"nvd":[{"id":"CVE-2021-43521","description":"A Buffer Overflow vulnerability exists in zlog 1.2.15 via zlog_conf_build_with_file in src/zlog/src/conf.c.","status":"published","published":"2022-04-08T16:15:08.2Z","modified":"2026-06-17T04:11:03.79Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:07:05.581807Z"}],"osv":[{"id":"CVE-2021-43521","description":"A Buffer Overflow vulnerability exists in zlog 1.2.15 via zlog_conf_build_with_file in src/zlog/src/conf.c.","status":"published","published":"2022-04-08T16:15:08.2Z","modified":"2026-10-20T10:54:09.342250869Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:21.877444Z"},{"id":"OESA-2022-1652","title":"zlog security update","description":"zlog is a reliable, high-performance, thread safe, flexible, clear-model, pure C logging library.\r\n\r\nSecurity Fix(es):\r\n\r\nA Buffer Overflow vulnerability exists in zlog 1.2.15 via zlog_conf_build_with_file in src/zlog/src/conf.c.(CVE-2021-43521)","status":"published","published":"2022-05-11T11:04:55Z","modified":"2026-08-18T01:16:35.119550361Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:39.528805Z"}]}}