{"id":"UBUNTU-CVE-2020-23911","details":"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.","modified":"2026-05-20T16:04:16.730554303Z","published":"2023-07-18T14:15:00Z","upstream":["CVE-2020-23911"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-23911"},{"type":"REPORT","url":"https://github.com/vlm/asn1c/issues/394"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-23911"}],"affected":[{"package":{"name":"asn1c","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/asn1c?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.24+dfsg-1"],"ecosystem_specific":{"binaries":[{"binary_name":"asn1c","binary_version":"0.9.24+dfsg-1"}],"priority_reason":"No real security impact as this is a command-line utility that is not generally expected to handle untrusted input."},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-23911.json"}},{"package":{"name":"asn1c","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/asn1c?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.28+dfsg-2"],"ecosystem_specific":{"binaries":[{"binary_name":"asn1c","binary_version":"0.9.28+dfsg-2"}],"priority_reason":"No real security impact as this is a command-line utility that is not generally expected to handle untrusted input."},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-23911.json"}},{"package":{"name":"asn1c","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/asn1c?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.28+dfsg-3"],"ecosystem_specific":{"binaries":[{"binary_version":"0.9.28+dfsg-3","binary_name":"asn1c"}],"priority_reason":"No real security impact as this is a command-line utility that is not generally expected to handle untrusted input."},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-23911.json"}},{"package":{"name":"asn1c","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/asn1c?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.28+dfsg-3"],"ecosystem_specific":{"binaries":[{"binary_version":"0.9.28+dfsg-3","binary_name":"asn1c"}],"priority_reason":"No real security impact as this is a command-line utility that is not generally expected to handle untrusted input."},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-23911.json"}},{"package":{"name":"asn1c","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/asn1c?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.28+dfsg-5"],"ecosystem_specific":{"priority_reason":"No real security impact as this is a command-line utility that is not generally expected to handle untrusted input.","binaries":[{"binary_name":"asn1c","binary_version":"0.9.28+dfsg-5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-23911.json"}},{"package":{"name":"asn1c","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/asn1c?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.28+dfsg-5"],"ecosystem_specific":{"binaries":[{"binary_version":"0.9.28+dfsg-5","binary_name":"asn1c"}],"priority_reason":"No real security impact as this is a command-line utility that is not generally expected to handle untrusted input."},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-23911.json"}},{"package":{"name":"asn1c","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/asn1c?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.28+dfsg-5","0.9.28+dfsg-5build1","0.9.28+dfsg-6"],"ecosystem_specific":{"binaries":[{"binary_name":"asn1c","binary_version":"0.9.28+dfsg-6"}],"priority_reason":"No real security impact as this is a command-line utility that is not generally expected to handle untrusted input."},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-23911.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"low"}]}