UpHeron
All vulnerabilities

Servers and applications

CVE-2016-4553

client_side.cc in Squid before 3.5.18 and 4.x before 4.0.10 does not properly ignore the Host header when absolute-URI is provided, which allows remote attackers to conduct cache-poisoning attacks via an HTTP request.

Severity
High 8.6
Published
10 May 2016
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
80% in the next 30 daysHigher than 99% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
Insufficient verification of data authenticity (CWE-345)
Attack
Over the network · No login needed · No user action needed
Attacker can
Change data
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Sources
NVD

Affected software

SoftwareAffected versions
SquidServers and applications · cpe:a:squid-cache:squid
  • Version 4.0.9
  • Version 4.0.8
  • Version 4.0.7
  • Version 4.0.6
All 10 release lines
  • Every version up to 3.5.17
  • Version 4.0.1
  • Version 4.0.2
  • Version 4.0.3
  • Version 4.0.4
  • Version 4.0.5
  • Version 4.0.6
  • Version 4.0.7
  • Version 4.0.8
  • Version 4.0.9

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2016-4553
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2016-4553