{"id":"CVE-2018-20355","aliases":["EUVD-2018-12913","GHSA-9q6r-hpgq-gfqm"],"status":"published","title":"An invalid write of 8 bytes due to a use-after-free vulnerability in the...","description":"An invalid write of 8 bytes due to a use-after-free vulnerability in the mg_http_free_proto_data_cgi function call in mongoose.c in Cesanta Mongoose Embedded Web Server Library 6.13 and earlier allows a denial of service (application crash) or remote code execution.","severity":{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.03574,"percentile":0.89456,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-416"],"published":"2019-06-10T16:23:43Z","modified":"2026-10-24T10:30:59Z","products":[{"vendor":"cesanta","product":"mongoose"}],"references":[{"url":"https://github.com/insi2304/mongoose-6.13-fuzz/blob/master/Simplest_Web_Server_Use_After_Free-mg_http_free_proto_data_cgi.png","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-20355"},{"url":"https://github.com/advisories/GHSA-9q6r-hpgq-gfqm"}],"sources":{"cve":[{"id":"CVE-2018-20355","description":"An invalid write of 8 bytes due to a use-after-free vulnerability in the mg_http_free_proto_data_cgi function call in mongoose.c in Cesanta Mongoose Embedded Web Server Library 6.13 and earlier allows a denial of service (application crash) or remote code execution.","status":"published","published":"2019-06-10T16:23:43Z","modified":"2024-08-05T11:58:18.964Z","updated_at":"2026-11-02T14:34:59.872731Z"}],"euvd":[{"id":"EUVD-2018-12913","description":"An invalid write of 8 bytes due to a use-after-free vulnerability in the mg_http_free_proto_data_cgi function call in mongoose.c in Cesanta Mongoose Embedded Web Server Library 6.13 and earlier allows a denial of service (application crash) or remote code execution.","status":"published","published":"2019-06-10T16:23:43Z","modified":"2024-08-05T11:58:18Z","updated_at":"2026-11-03T02:39:31.423203Z"}],"ghsa":[{"id":"GHSA-9q6r-hpgq-gfqm","title":"An invalid write of 8 bytes due to a use-after-free vulnerability in the...","description":"An invalid write of 8 bytes due to a use-after-free vulnerability in the mg_http_free_proto_data_cgi function call in mongoose.c in Cesanta Mongoose Embedded Web Server Library 6.13 and earlier allows a denial of service (application crash) or remote code execution.","status":"published","published":"2022-05-24T16:47:41Z","modified":"2024-04-04T00:54:50Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:55:53.307931Z"}],"nvd":[{"id":"CVE-2018-20355","description":"An invalid write of 8 bytes due to a use-after-free vulnerability in the mg_http_free_proto_data_cgi function call in mongoose.c in Cesanta Mongoose Embedded Web Server Library 6.13 and earlier allows a denial of service (application crash) or remote code execution.","status":"published","published":"2019-06-10T17:29:02.127Z","modified":"2026-06-17T01:52:41.037Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/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-416"],"updated_at":"2026-11-02T14:04:57.307075Z"}],"osv":[{"id":"CVE-2018-20355","description":"An invalid write of 8 bytes due to a use-after-free vulnerability in the mg_http_free_proto_data_cgi function call in mongoose.c in Cesanta Mongoose Embedded Web Server Library 6.13 and earlier allows a denial of service (application crash) or remote code execution.","status":"published","published":"2019-06-10T17:29:02.127Z","modified":"2026-10-24T10:30:59.41391698Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:09.145458Z"}]}}