CVE-2019-18677

Publication date 26 November 2019

Last updated 25 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

6.1 · Medium

Score breakdown

Description

An issue was discovered in Squid 3.x and 4.x through 4.8 when the append_domain setting is used (because the appended characters do not properly interact with hostname length restrictions). Due to incorrect message processing, it can inappropriately redirect traffic to origins it should not be delivered to.

Status

Package Ubuntu Release Status
squid 21.04 hirsute
Fixed 4.9-2ubuntu1
20.10 groovy
Fixed 4.9-2ubuntu1
20.04 LTS focal
Fixed 4.9-2ubuntu1
19.10 eoan
Fixed 4.8-1ubuntu2.1
19.04 disco
Fixed 4.4-1ubuntu2.3
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
19.04 disco Not in release
18.04 LTS bionic
Fixed 3.5.27-1ubuntu1.4
16.04 LTS xenial
Fixed 3.5.12-1ubuntu7.9
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
squid3

Severity score breakdown

CVSS version: CVSS v3.0

Base score 6.1 · Medium

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

References

Related Ubuntu Security Notices (USN)

    • USN-4213-1
    • Squid vulnerabilities
    • 4 December 2019

Other references

Access our resources on patching vulnerabilities