{"id":"CVE-2020-25756","aliases":["DEBIAN-CVE-2020-25756","EUVD-2020-18407","GHSA-p959-hwch-c2xg"],"status":"disputed","title":"** DISPUTED ** A buffer overflow vulnerability exists in the mg_get_http_header function in...","description":"A buffer overflow vulnerability exists in the mg_get_http_header function in Cesanta Mongoose 6.18 due to a lack of bounds checking. A crafted HTTP header can exploit this bug. NOTE: a committer has stated \"this will not happen in practice.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01616,"percentile":0.76221,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-120"],"published":"2020-09-18T04:44:50Z","modified":"2026-10-26T12:01:04Z","fixes":[{"ecosystem":"Debian:12","package":"swupdate","fixed_in":["2022.12+dfsg-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"swupdate","fixed_in":["2022.12+dfsg-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"swupdate","fixed_in":["2022.12+dfsg-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"swupdate","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2022.12+dfsg-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"swupdate","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2022.12+dfsg-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"swupdate","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2022.12+dfsg-1"}]}]}],"products":[{"vendor":"cesanta","product":"mongoose"}],"references":[{"url":"https://github.com/cesanta/mongoose/issues/1135","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Patch","Third Party Advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-25756"},{"url":"https://github.com/advisories/GHSA-p959-hwch-c2xg"},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-25756","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2020-25756","description":"A buffer overflow vulnerability exists in the mg_get_http_header function in Cesanta Mongoose 6.18 due to a lack of bounds checking. 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A crafted HTTP header can exploit this bug. NOTE: a committer has stated \"this will not happen in practice.\"","status":"published","published":"2022-05-24T17:29:00Z","modified":"2024-03-21T03:33:56Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T14:55:42.026509Z"}],"nvd":[{"id":"CVE-2020-25756","description":"A buffer overflow vulnerability exists in the mg_get_http_header function in Cesanta Mongoose 6.18 due to a lack of bounds checking. A crafted HTTP header can exploit this bug. NOTE: a committer has stated \"this will not happen in practice.","status":"disputed","published":"2020-09-18T05:15:13.197Z","modified":"2026-06-17T03:07:15.027Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T14:06:15.83396Z"}],"osv":[{"id":"CVE-2020-25756","description":"A buffer overflow vulnerability exists in the mg_get_http_header function in Cesanta Mongoose 6.18 due to a lack of bounds checking. A crafted HTTP header can exploit this bug. 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