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Servers and applications

CVE-2021-28662

SQUID-2021:2 Denial of Service in HTTP Response Processing

Severity
Medium 6.5
Published
10 May 2021
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
4.15, 5.0.6
Also known as
GHSA-jjq6-mh2h-g39h
Sources
NVD, Project advisories (GitHub)

Description

An issue was discovered in Squid 4.x before 4.15 and 5.x before 5.0.6. If a remote server sends a certain response header over HTTP or HTTPS, there is a denial of service. This header can plausibly occur in benign network traffic.

Affected software

SoftwareAffected versions
SquidServers and applications · cpe:a:squid-cache:squid
  • From 4.0.1 before 4.15
  • From 5.0 before 5.0.6
SquidServers and applications · github:squid-cache/squid
  • From 5.0.1 before 5.0.6

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-28662
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-28662
  • GitHub Advisory Database https://github.com/advisories/GHSA-jjq6-mh2h-g39h
  • github.com https://github.com/squid-cache/squid/security/advisories/GHSA-jjq6-mh2h-g39h