{"cve":"CVE-2019-20637","nvd":{"published":"2020-04-08T23:15:12.623","modified":"2026-06-17T02:30:51.083","status":"Modified","description":"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 request within the same connection. This sometimes causes information to be disclosed from the connection workspace, such as data structures associated with previous requests within this connection or VCL-related temporary headers.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":["CWE-212"],"references":["http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00026.html","http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00031.html","http://varnish-cache.org/security/VSV00004.html#vsv00004","http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00026.html","http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00031.html"],"products":["opensuse:backports_sle","opensuse:leap","varnish-cache:varnish_cache","varnish-software:varnish_cache"],"source":"nvd","synced_at":"2026-10-19T21:03:08.679916934+00:00"},"epss":{"cve":"CVE-2019-20637","score":0.0179,"percentile":0.7837,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}