UpHeron
All vulnerabilities

Servers and applications

CVE-2019-18677

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.

Severity
Medium 6.1
Published
26 Nov 2019
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
3.9% in the next 30 daysHigher than 90% of CVEs. EPSS by FIRST, 10 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
SquidServers and applications · cpe:a:squid-cache:squid
  • From 4.0 up to 4.8
  • From 3.0 up to 3.5.28
  • Version 2.7-stable9
  • Version 2.7-stable8
All 11 release lines
  • From 2.0 up to 2.7
  • Version 2.7-stable2
  • Version 2.7-stable3
  • Version 2.7-stable4
  • Version 2.7-stable5
  • Version 2.7-stable6
  • Version 2.7-stable7
  • Version 2.7-stable8
  • Version 2.7-stable9
  • From 3.0 up to 3.5.28
  • From 4.0 up to 4.8

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2019-18677
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2019-18677