---
title: "CVE-2020-8450\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-2020-8450?format=md
keywords: index, follow
---

# CVE-2020-8450

Publication date 4 February 2020

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**7.3 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2020-8450?format=md#impact-score)

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## Description

An issue was discovered in Squid before 4.10. Due to incorrect buffer
management, a remote client can cause a buffer overflow in a Squid instance
acting as a reverse proxy.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2020-8450?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| squid | 21.04 hirsute | Fixed 4.9-2ubuntu4 |
| 20.10 groovy | Fixed 4.9-2ubuntu4 |
| 20.04 LTS focal | Fixed 4.9-2ubuntu4 |
| 19.10 eoan | Fixed 4.8-1ubuntu2.2 |
| 18.04 LTS bionic | Not in release |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| squid3 | 21.04 hirsute | Not in release |
| 20.10 groovy | Not in release |
| 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 18.04 LTS bionic | Fixed 3.5.27-1ubuntu1.5 |
| 16.04 LTS xenial | Fixed 3.5.12-1ubuntu7.10 |
| 14.04 LTS trusty | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2020-8450?format=md#patch-details)

## Notes

---

### [mdeslaur](https://launchpad.net/~mdeslaur)

same commits as CVE-2020-8449

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| squid | * Upstream:   <http://www.squid-cache.org/Versions/v4/changesets/SQUID-2020_1.patch> * Upstream:   <http://www.squid-cache.org/Versions/v4/changesets/squid-4-b3a0719affab099c684f1cd62b79ab02816fa962.patch> |
| squid3 | * Upstream:   <http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2020_1.patch> |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.3 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.3 · High |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8450)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2020-8450)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2020-8450)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2020-8450)

### Related Ubuntu Security Notices (USN)

+ [USN-4289-1](https://usn.ubuntu.com/USN-4289-1)
+ Squid vulnerabilities
+ 20 February 2020

### Other references

* <http://www.squid-cache.org/Advisories/SQUID-2020_1.txt>
* <https://www.cve.org/CVERecord?id=CVE-2020-8450>