Varnish · Varnish Cache · CVE-2019-20637
**Name of the Vulnerable Software and Affected Versions**
Varnish Cache versions prior to 6.0.5 LTS
Varnish Cache versions 6.1.x through 6.2.1
Varnish Cache versions 6.3.x through 6.3.0
**Description**
An issue was discovered in Varnish Cache where 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.
**Recommendations**
For versions prior to 6.0.5 LTS, update to version 6.0.5 LTS or later.
For versions 6.1.x through 6.2.1, update to version 6.2.2 or later.
For versions 6.3.x through 6.3.0, update to version 6.3.1 or later.