CVE-2021-28116

Publication date 9 March 2021

Last updated 18 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

3.7 · Low

Score breakdown

Description

Squid through 4.14 and 5.x through 5.0.5, in some configurations, allows information disclosure because of an out-of-bounds read in WCCP protocol data. This can be leveraged as part of a chain for remote code execution as nobody.

Status

Package Ubuntu Release Status
squid 25.10 questing
Fixed 4.13-10ubuntu5
25.04 plucky
Fixed 4.13-10ubuntu5
24.10 oracular
Fixed 4.13-10ubuntu5
24.04 LTS noble
Fixed 4.13-10ubuntu5
23.10 mantic
Fixed 4.13-10ubuntu5
23.04 lunar
Fixed 4.13-10ubuntu5
22.10 kinetic
Fixed 4.13-10ubuntu5
22.04 LTS jammy
Fixed 4.13-10ubuntu5
21.10 impish
Fixed 4.13-10ubuntu5
21.04 hirsute
Fixed 4.13-1ubuntu4.2
20.10 groovy Ignored end of life
20.04 LTS focal
Fixed 4.10-1ubuntu1.5
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
squid3 25.10 questing Not in release
25.04 plucky Not in release
24.10 oracular Not in release
24.04 LTS noble Not in release
23.10 mantic Not in release
23.04 lunar Not in release
22.10 kinetic Not in release
22.04 LTS jammy Not in release
21.10 impish Not in release
21.04 hirsute Not in release
20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Fixed 3.5.27-1ubuntu1.12
16.04 LTS xenial
Vulnerable
14.04 LTS trusty Not in release

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
squid

Severity score breakdown

Parameter Value
Base score 3.7 · Low
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

References

Related Ubuntu Security Notices (USN)

Other references