{"id":"UBUNTU-CVE-2020-21687","details":"Buffer Overflow vulnerability in scan function in stdscan.c in nasm 2.15rc0 allows remote attackers to cause a denial of service via crafted asm file.","modified":"2025-09-08T16:46:16Z","published":"2023-08-22T19:16:00Z","withdrawn":"2025-09-12T04:54:40Z","upstream":["CVE-2020-21687"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-21687"},{"type":"REPORT","url":"https://bugzilla.nasm.us/show_bug.cgi?id=3392645"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-21687"}],"affected":[{"package":{"name":"nasm","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/nasm@2.11.08-1ubuntu0.1?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.11.06-1really2.11.05-1","2.11.08-1","2.11.08-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"nasm","binary_version":"2.11.08-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-21687.json"}},{"package":{"name":"nasm","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/nasm@2.13.02-0.1?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.13.01-2","2.13.02-0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"nasm","binary_version":"2.13.02-0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-21687.json"}},{"package":{"name":"nasm","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/nasm@2.14.02-1?arch=source&distro=esm-apps/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.14.02-1"],"ecosystem_specific":{"binaries":[{"binary_name":"nasm","binary_version":"2.14.02-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-21687.json"}},{"package":{"name":"nasm","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/nasm@2.15.05-1?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.15.05-1"],"ecosystem_specific":{"binaries":[{"binary_name":"nasm","binary_version":"2.15.05-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-21687.json"}},{"package":{"name":"nasm","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/nasm@2.16.01-1build1?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.16.01-1","2.16.01-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"nasm","binary_version":"2.16.01-1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-21687.json"}},{"package":{"name":"nasm","ecosystem":"Ubuntu:25.04","purl":"pkg:deb/ubuntu/nasm@2.16.03-1?arch=source&distro=plucky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.16.03-1"],"ecosystem_specific":{"binaries":[{"binary_name":"nasm","binary_version":"2.16.03-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-21687.json"}}],"schema_version":"1.7.3","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":"medium"}]}