UBUNTU-CVE-2019-20637

    Dashboard / Vulnerabilities / UBUNTU-CVE-2019-20637

    UBUNTU-CVE-2019-20637

    Published: 8 Apr 2020Last Modified: 22 Apr 2026
    Upstream:
    CVE-2019-20637
    Aliases:
    USN-5474-1

    Summary:

    Details: 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.

    References: https://ubuntu.com/security/CVE-2019-20637, http://varnish-cache.org/security/VSV00004.html#vsv00004, https://github.com/varnishcache/varnish-cache/commit/bd7b3d6d47ccbb5e1747126f8e2a297f38e56b8c, https://ubuntu.com/security/notices/USN-5474-1, https://www.cve.org/CVERecord?id=CVE-2019-20637

    Affected packages

    Package

    Name: varnish

    Purl: pkg:deb/ubuntu/[email protected]?arch=source&distro=bionic

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -5.2.1-1ubuntu0.1

    Affected versions

    5.0.0-7.1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2019-20637 | CVE-DB