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Vulnerability record · CVE-2022-23959 · published 26 January 2022

CVE-2022-23959: Varnish-software varnich cache http request smuggling vulnerability

Varnish Software · Varnich Cache

In Varnish Cache before 6.6.2 and 7.x before 7.0.2, Varnish Cache 6.0 LTS before 6.0.10, and and Varnish Enterprise (Cache Plus) 4.1.x before 4.1.11r6 and 6.0.x before 6.0.9r4, request smuggling can occur for HTTP/1 connections.

9.1 CVSS 3.1 Critical EPSS 2.0% · top 20.4% CWE-444 · HTTP request smuggling
9.1CVSS 3.1 base score, v2 6.4
2.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

In Varnish Cache before 6.6.2 and 7.x before 7.0.2, Varnish Cache 6.0 LTS before 6.0.10, and and Varnish Enterprise (Cache Plus) 4.1.x before 4.1.11r6 and 6.0.x before 6.0.9r4, request smuggling can occur for HTTP/1 connections.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

6 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://docs.varnish-software.com/security/VSV00008/ MitigationVendor Advisory
https://lists.debian.org/debian-lts-announce/2022/02/msg00014.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UMMDMQWNAE3BTSZUHXQHVAM
https://varnish-cache.org/security/VSV00008.html MitigationVendor Advisory
https://www.debian.org/security/2022/dsa-5088 Third Party Advisory
https://docs.varnish-software.com/security/VSV00008/ MitigationVendor Advisory
https://lists.debian.org/debian-lts-announce/2022/02/msg00014.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UMMDMQWNAE3BTSZUHXQHVAM
https://varnish-cache.org/security/VSV00008.html MitigationVendor Advisory
https://www.debian.org/security/2022/dsa-5088 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2022-23959), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.