{"id":"CVE-2020-23911","aliases":["DEBIAN-CVE-2020-23911","EUVD-2020-16648","GHSA-g4q7-qpw3-v546","UBUNTU-CVE-2020-23911"],"status":"published","title":"An issue was discovered in asn1c through v0.9.28. A NULL pointer dereference exists in the...","description":"An issue was discovered in asn1c through v0.9.28. A NULL pointer dereference exists in the function _default_error_logger() located in asn1fix.c. It allows an attacker to cause Denial of Service.","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00296,"percentile":0.22466,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-476"],"published":"2023-07-18T00:00:00Z","modified":"2026-10-26T12:00:10Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"asn1c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.28+dfsg-5","0.9.28+dfsg-6","0.9.28+dfsg-7"]},{"source":"osv","ecosystem":"Debian:13","package":"asn1c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.28+dfsg-5","0.9.28+dfsg-6","0.9.28+dfsg-7"]},{"source":"osv","ecosystem":"Debian:14","package":"asn1c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.28+dfsg-5","0.9.28+dfsg-6","0.9.28+dfsg-7"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"asn1c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.24+dfsg-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"asn1c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.28+dfsg-2"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"asn1c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.28+dfsg-3"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"asn1c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.28+dfsg-3"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"asn1c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.28+dfsg-5"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"asn1c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.28+dfsg-5"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"asn1c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.28+dfsg-6","0.9.28+dfsg-7"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"asn1c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.28+dfsg-5","0.9.28+dfsg-5build1","0.9.28+dfsg-6"]}],"products":[{"vendor":"asn1c_project","product":"asn1c"}],"references":[{"url":"https://github.com/vlm/asn1c/issues/394","tags":["x_transferred","Exploit","Issue Tracking","Patch","Vendor Advisory","fix","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-23911"},{"url":"https://github.com/advisories/GHSA-g4q7-qpw3-v546"},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-23911","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-23911","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-23911","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2020-23911","description":"An issue was discovered in asn1c through v0.9.28. A NULL pointer dereference exists in the function _default_error_logger() located in asn1fix.c. It allows an attacker to cause Denial of Service.","status":"published","published":"2023-07-18T00:00:00Z","modified":"2024-10-28T18:25:06.931Z","updated_at":"2026-11-02T14:35:49.209579Z"}],"euvd":[{"id":"EUVD-2020-16648","description":"An issue was discovered in asn1c through v0.9.28. A NULL pointer dereference exists in the function _default_error_logger() located in asn1fix.c. It allows an attacker to cause Denial of Service.","status":"published","published":"2023-07-18T00:00:00Z","modified":"2024-10-28T18:25:06Z","updated_at":"2026-11-03T00:05:16.135425Z"}],"ghsa":[{"id":"GHSA-g4q7-qpw3-v546","title":"An issue was discovered in asn1c through v0.9.28. A NULL pointer dereference exists in the...","description":"An issue was discovered in asn1c through v0.9.28. A NULL pointer dereference exists in the function _default_error_logger() located in asn1fix.c. It allows an attacker to cause Denial of Service.","status":"published","published":"2023-07-18T15:30:36Z","modified":"2024-04-04T06:13:12Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:56:40.370348Z"}],"nvd":[{"id":"CVE-2020-23911","description":"An issue was discovered in asn1c through v0.9.28. A NULL pointer dereference exists in the function _default_error_logger() located in asn1fix.c. It allows an attacker to cause Denial of Service.","status":"published","published":"2023-07-18T14:15:11.537Z","modified":"2026-06-17T03:05:05.027Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:06:47.910346Z"}],"osv":[{"id":"CVE-2020-23911","description":"An issue was discovered in asn1c through v0.9.28. A NULL pointer dereference exists in the function _default_error_logger() located in asn1fix.c. It allows an attacker to cause Denial of Service.","status":"published","published":"2023-07-18T14:15:11.537Z","modified":"2026-10-20T10:49:37.408988711Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:15.534837Z"},{"id":"DEBIAN-CVE-2020-23911","description":"An issue was discovered in asn1c through v0.9.28. A NULL pointer dereference exists in the function _default_error_logger() located in asn1fix.c. It allows an attacker to cause Denial of Service.","status":"published","published":"2023-07-18T14:15:11.537Z","modified":"2026-10-26T12:00:10.376480153Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:33.729655Z"},{"id":"UBUNTU-CVE-2020-23911","description":"An issue was discovered in asn1c through v0.9.28. A NULL pointer dereference exists in the function _default_error_logger() located in asn1fix.c. It allows an attacker to cause Denial of Service.","status":"published","published":"2023-07-18T14:15:00Z","modified":"2026-10-17T12:55:52.227451581Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:54:23.905183Z"}]}}