{"id":"CVE-2021-46520","aliases":["EUVD-2021-33196","GHSA-cjxw-c723-f938"],"status":"published","title":"Cesanta MJS v2.20.0 was discovered to contain a heap buffer overflow via mjs_jprintf at src...","description":"Cesanta MJS v2.20.0 was discovered to contain a heap buffer overflow via mjs_jprintf at src/mjs_util.c.","severity":{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.0073,"percentile":0.54725,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2022-01-27T20:22:09Z","modified":"2026-10-20T10:55:09Z","products":[{"vendor":"cesanta","product":"mjs"}],"references":[{"url":"https://github.com/cesanta/mjs/issues/193","tags":["x_refsource_MISC","x_transferred","Exploit","Issue Tracking","Third Party Advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-46520"},{"url":"https://github.com/advisories/GHSA-cjxw-c723-f938"}],"sources":{"cve":[{"id":"CVE-2021-46520","description":"Cesanta MJS v2.20.0 was discovered to contain a heap buffer overflow via mjs_jprintf at src/mjs_util.c.","status":"published","published":"2022-01-27T20:22:09Z","modified":"2024-08-04T05:10:35.323Z","updated_at":"2026-11-02T14:33:02.930115Z"}],"euvd":[{"id":"EUVD-2021-33196","description":"Cesanta MJS v2.20.0 was discovered to contain a heap buffer overflow via mjs_jprintf at src/mjs_util.c.","status":"published","published":"2022-01-27T20:22:09Z","modified":"2024-08-04T05:10:35Z","updated_at":"2026-11-03T03:08:23.591313Z"}],"ghsa":[{"id":"GHSA-cjxw-c723-f938","title":"Cesanta MJS v2.20.0 was discovered to contain a heap buffer overflow via mjs_jprintf at src...","description":"Cesanta MJS v2.20.0 was discovered to contain a heap buffer overflow via mjs_jprintf at src/mjs_util.c.","status":"published","published":"2022-01-28T00:01:21Z","modified":"2023-02-03T05:05:23Z","cwes":["CWE-787"],"updated_at":"2026-11-02T14:53:43.901857Z"}],"nvd":[{"id":"CVE-2021-46520","description":"Cesanta MJS v2.20.0 was discovered to contain a heap buffer overflow via mjs_jprintf at src/mjs_util.c.","status":"published","published":"2022-01-27T21:15:09.947Z","modified":"2026-06-17T04:15:00.577Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:07:04.178977Z"}],"osv":[{"id":"CVE-2021-46520","description":"Cesanta MJS v2.20.0 was discovered to contain a heap buffer overflow via mjs_jprintf at src/mjs_util.c.","status":"published","published":"2022-01-27T21:15:09.947Z","modified":"2026-10-20T10:55:09.900978193Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:22.18434Z"}]}}