---
title: "CVE-2022-23959\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2022-23959?format=md
keywords: index, follow
---

# CVE-2022-23959

Publication date 26 January 2022

Last updated 11 July 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**9.1 · Critical**

[Score breakdown](https://ubuntu.com/security/CVE-2022-23959?format=md#impact-score)

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## 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.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| varnish | 26.04 LTS resolute | Needs evaluation |
| 25.10 questing | Ignored end of life, was needs-triage |
| 25.04 plucky | Ignored end of life, was needs-triage |
| 24.10 oracular | Ignored end of life, was needs-triage |
| 24.04 LTS noble | Needs evaluation |
| 23.10 mantic | Ignored end of life, was needs-triage |
| 23.04 lunar | Ignored end of life, was needs-triage |
| 22.10 kinetic | Ignored end of life, was needs-triage |
| 22.04 LTS jammy | Fixed 6.6.1-1ubuntu0.2 |
| 21.10 impish | Fixed 6.5.2-1ubuntu0.2 |
| 20.04 LTS focal | Fixed 6.2.1-2ubuntu0.1 |
| 18.04 LTS bionic | Fixed 5.2.1-1ubuntu0.1 |
| 16.04 LTS xenial | Needs evaluation |
| 14.04 LTS trusty | Needs evaluation |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

9.1 · Critical

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | High |
  | Integrity impact | High |
  | Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 9.1 · Critical |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-23959)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2022-23959)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2022-23959)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2022-23959)

### Related Ubuntu Security Notices (USN)

+ [USN-5474-1](https://usn.ubuntu.com/USN-5474-1)
+ Varnish Cache vulnerabilities
+ 8 June 2022

### Other references

* <https://varnish-cache.org/security/VSV00008.html>
* <https://docs.varnish-software.com/security/VSV00008/>
* <https://www.cve.org/CVERecord?id=CVE-2022-23959>