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Vulnerability record · CVE-2019-20637 · published 8 April 2020

CVE-2019-20637: Varnish-cache varnish cache vulnerability

Varnish Cache · Varnish Cache

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.

7.5 CVSS 3.1 High EPSS 1.8% · top 22.4% CWE-212 · CWE-212
7.5CVSS 3.1 base score, v2 5.0
1.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00026.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00031.html Mailing ListThird Party Advisory
http://varnish-cache.org/security/VSV00004.html#vsv00004 Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00026.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00031.html Mailing ListThird Party Advisory
http://varnish-cache.org/security/VSV00004.html#vsv00004 Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-20637), CISA KEV, FIRST EPSS (scores of 2026-10-02). This page is refreshed as NVD updates the record.