CVE-2019-20637: Opensuse Backports Sle

High severity, CVSS 7.5. EPSS: 1.8% chance of exploitation in the next 30 days.

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.

Affected products

• Opensuse Backports Sle: version 15.0 only
• Opensuse Leap: version 15.1 only
• Varnish-Cache Varnish Cache: from 6.1.0, before 6.2.2 (fixed in 6.2.2); from 6.3.0, before 6.3.1 (fixed in 6.3.1)
• Varnish-Software Varnish Cache: from 6.0.0, before 6.0.5 (fixed in 6.0.5)

Published 2020-04-08. Last modified 2026-06-17.