{"action":"Upgrade linux to 5.5.13-1 or later.","affected":[{"fixed":"5.5.13-1","introduced":"0"}],"component":"linux","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["5.5.13-1"],"id":"tcs_01M5NFAM5Q36G893DBT0X4C3SW","modified_at":"2026-10-23T18:03:10.353766981Z","published_at":"2021-05-26T21:15:08.157Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-20177","https://security-tracker.debian.org/tracker/CVE-2021-20177"],"severity":{"label":"medium","score":4.4},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-20177","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-20177"}],"summary":"A flaw was found in the Linux kernel's implementation of string matching within a packet. A privileged user (with root or CAP_NET_ADMIN) when inserting iptables rules could insert a rule which can pan"}