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Vulnerability details: VCID-qswj-nhpw-3qgr
Vulnerability ID VCID-qswj-nhpw-3qgr
Aliases CVE-2020-11653
Summary An issue was discovered in Varnish Cache before 6.0.6 LTS, 6.1.x and 6.2.x before 6.2.3, and 6.3.x before 6.3.2. It occurs when communication with a TLS termination proxy uses PROXY version 2. There can be an assertion failure and daemon restart, which causes a performance loss.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-400 Uncontrolled Resource Consumption
CWE-617 Reachable Assertion
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-11653.json
epss 0.00454 https://api.first.org/data/v1/epss?cve=CVE-2020-11653
epss 0.00454 https://api.first.org/data/v1/epss?cve=CVE-2020-11653
epss 0.00454 https://api.first.org/data/v1/epss?cve=CVE-2020-11653
epss 0.00454 https://api.first.org/data/v1/epss?cve=CVE-2020-11653
epss 0.00454 https://api.first.org/data/v1/epss?cve=CVE-2020-11653
epss 0.00454 https://api.first.org/data/v1/epss?cve=CVE-2020-11653
epss 0.00454 https://api.first.org/data/v1/epss?cve=CVE-2020-11653
epss 0.00454 https://api.first.org/data/v1/epss?cve=CVE-2020-11653
epss 0.00454 https://api.first.org/data/v1/epss?cve=CVE-2020-11653
epss 0.00454 https://api.first.org/data/v1/epss?cve=CVE-2020-11653
epss 0.00454 https://api.first.org/data/v1/epss?cve=CVE-2020-11653
epss 0.00454 https://api.first.org/data/v1/epss?cve=CVE-2020-11653
epss 0.00454 https://api.first.org/data/v1/epss?cve=CVE-2020-11653
epss 0.00454 https://api.first.org/data/v1/epss?cve=CVE-2020-11653
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2020-11653
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2020-11653
Reference id Reference type URL
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00026.html
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00031.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-11653.json
https://api.first.org/data/v1/epss?cve=CVE-2020-11653
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-11653
https://lists.debian.org/debian-lts-announce/2022/11/msg00036.html
https://varnish-cache.org/security/VSV00005.html#vsv00005
1813867 https://bugzilla.redhat.com/show_bug.cgi?id=1813867
956307 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=956307
cpe:2.3:a:opensuse:backports_sle:15.0:sp1:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:opensuse:backports_sle:15.0:sp1:*:*:*:*:*:*
cpe:2.3:a:varnish-cache:varnish_cache:*:*:*:*:-:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:varnish-cache:varnish_cache:*:*:*:*:-:*:*:*
cpe:2.3:a:varnish-software:varnish_cache:*:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:varnish-software:varnish_cache:*:*:*:*:lts:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
CVE-2020-11653 https://nvd.nist.gov/vuln/detail/CVE-2020-11653
RHSA-2020:4756 https://access.redhat.com/errata/RHSA-2020:4756
USN-5474-1 https://usn.ubuntu.com/5474-1/
USN-5474-2 https://usn.ubuntu.com/5474-2/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-11653.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2020-11653
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2020-11653
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.62826
EPSS Score 0.00454
Published At June 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-01T12:10:33.836394+00:00 Ubuntu USN Importer Import https://usn.ubuntu.com/5474-2/ 36.1.3