{"action":"Upgrade varnish to 6.4.0-1 or later.","affected":[{"fixed":"6.4.0-1","introduced":"0"}],"component":"varnish","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["6.4.0-1"],"id":"tcs_01M5NE50FB2Q2QJW8KSFSHTH35","modified_at":"2026-09-21T07:00:42.048358453Z","published_at":"2020-04-08T23:15:12.623Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2019-20637","https://security-tracker.debian.org/tracker/CVE-2019-20637"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2019-20637","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2019-20637"}],"summary":"An issue was discovered in Varnish Cache before 6.0.5 LTS, 6.1.x and 6.2.x before 6.2.2, and 6.3.x before 6.3.1. It does not clear a pointer between the handling of one client request and the next req"}