{"action":"Upgrade nasm to 2.15.04-1 or later.","affected":[{"fixed":"2.15.04-1","introduced":"0"}],"component":"nasm","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["2.15.04-1"],"id":"tcs_01M5NESN003ZC1WTMMK7VD91SS","modified_at":"2026-09-11T11:02:20.485398874Z","published_at":"2023-08-22T19:16:14.327Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2020-21686","https://security-tracker.debian.org/tracker/CVE-2020-21686"],"severity":{"label":"medium","score":5.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2020-21686#Debian:14/nasm","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2020-21686"}],"summary":"A stack-use-after-scope issue discovered in expand_mmac_params function in preproc.c in nasm before 2.15.04 allows remote attackers to cause a denial of service via crafted asm file."}