CVE catalog
CVE-2019-20637
varnish: CVE-2019-20637
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 1.79% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | varnish | trixie | 7.7.0-3+deb13u1 | fixed |
| Debian | varnish | trixie-security | 7.7.0-3+deb13u2 | fixed |
| Debian | varnish | bookworm | 7.1.1-2+deb12u1 | fixed |
| Debian | varnish | bookworm-security | 7.1.1-2+deb12u1 | fixed |
| Ubuntu | varnish | 18.04 | 5.0.0-7.1 | vulnerable |
| Ubuntu | varnish | 18.04 | 5.2.1-1 | vulnerable |
| Ubuntu | varnish | 18.04 | 5.2.1-1ubuntu0.1 | fixed |
| Ubuntu | varnish | 20.04 | 6.1.1-1 | vulnerable |
| Ubuntu | varnish | 20.04 | 6.2.1-2 | vulnerable |
| Ubuntu | varnish | 20.04 | 6.2.1-2ubuntu0.1 | fixed |
| Ubuntu | varnish | 22.04 | 6.5.2-1 | vulnerable |
| Ubuntu | varnish | 22.04 | 6.6.1-1 | vulnerable |
| Ubuntu | varnish | 22.04 | 6.6.1-1ubuntu0.2 | fixed |
| Ubuntu | varnish | 18.04 | 5.0.0-7.1 | vulnerable |
| Ubuntu | varnish | 18.04 | 5.2.1-1 | vulnerable |
| Ubuntu | varnish | 18.04 | 5.2.1-1ubuntu0.1 | fixed |
| Ubuntu | varnish | 20.04 | 6.1.1-1 | vulnerable |
| Ubuntu | varnish | 20.04 | 6.2.1-2 | vulnerable |
| Ubuntu | varnish | 20.04 | 6.2.1-2ubuntu0.1 | fixed |
| Opensuse | varnish | leap 15.1 | 6.2.1-lp151.3.6.1 | fixed |
| Suse | varnish | package hub 15 sp1 | 6.2.1-bp151.4.6.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | varnish | source | trixie | 6.4.0-1 | not yet assigned | Not reported | [956305] |
| Debian | varnish | source | bookworm | 6.4.0-1 | not yet assigned | Not reported | [956305] |
| Ubuntu | varnish | deb | 18.04 | 5.2.1-1ubuntu0.1 | Not reported | USN-5474-1 | Not reported |
| Ubuntu | varnish | deb | 20.04 | 6.2.1-2ubuntu0.1 | Not reported | USN-5474-1 | Not reported |
| Ubuntu | varnish | deb | 22.04 | 6.6.1-1ubuntu0.2 | Not reported | USN-5474-1 | Not reported |
| Ubuntu | varnish | deb | 18.04 | 5.2.1-1ubuntu0.1 | Not reported | UBUNTU-CVE-2019-20637 | Not reported |
| Ubuntu | varnish | deb | 20.04 | 6.2.1-2ubuntu0.1 | Not reported | UBUNTU-CVE-2019-20637 | Not reported |
| Opensuse | varnish | rpm | leap 15.1 | 6.2.1-lp151.3.6.1 | Not reported | OPENSUSE-SU-2020:0808-1 | Not reported |
| Suse | varnish | rpm | package hub 15 sp1 | 6.2.1-bp151.4.6.1 | Not reported | OPENSUSE-SU-2020:0819-1 | Not reported |
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
[Debian 12 (Bookworm)]
- [libvarnishapi3]Unknown
Source package: [varnish]
Details (4)
7.1.1-2+deb12u1· amd64 · bookwormFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· arm64 · bookwormFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· amd64 · bookworm-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· arm64 · bookworm-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
- [libvarnishapi-dev]Unknown
Source package: [varnish]
Details (4)
7.1.1-2+deb12u1· amd64 · bookwormFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· arm64 · bookwormFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· amd64 · bookworm-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· arm64 · bookworm-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
- [varnish]Unknown
Details (4)
7.1.1-2+deb12u1· amd64 · bookwormFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· arm64 · bookwormFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· amd64 · bookworm-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· arm64 · bookworm-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
- [varnish-doc]Unknown
Source package: [varnish]
Details (4)
7.1.1-2+deb12u1· all · bookwormFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· all · bookwormFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· all · bookworm-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
7.1.1-2+deb12u1· all · bookworm-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · bookworm; dsa · varnish · debian · 12
[Debian 13 (Trixie)]
- [libvarnishapi3]Unknown
Source package: [varnish]
Details (4)
7.7.0-3+deb13u1· amd64 · trixieFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· arm64 · trixieFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· arm64 · trixie-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
- [libvarnishapi-dev]Unknown
Source package: [varnish]
Details (4)
7.7.0-3+deb13u1· amd64 · trixieFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· arm64 · trixieFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· arm64 · trixie-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
- [varnish]Unknown
Details (4)
7.7.0-3+deb13u1· amd64 · trixieFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· arm64 · trixieFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· arm64 · trixie-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
- [varnish-doc]Unknown
Source package: [varnish]
Details (4)
7.7.0-3+deb13u1· all · trixieFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· all · trixieFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· all · trixie-securityFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
7.7.0-3+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
6.4.0-1dsa · varnish · debian · 13
Observed:
References
- [https://access.redhat.com/errata/RHSA-2020:4756]
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2020_4756.json]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2019-20637]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2019-20637]
- [https://osv.dev/vulnerability/USN-5474-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2020:0808-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2020:0819-1]
- [https://security-tracker.debian.org/tracker/CVE-2019-20637]
- [https://wid.cert-bund.de/.well-known/csaf/white/2020/wid-sec-w-2022-0193.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]