UpHeron
All vulnerabilities

Servers and applications

CVE-2016-4556

Double free vulnerability in Esi.cc in Squid 3.x before 3.5.18 and 4.x before 4.0.10 allows remote servers to cause a denial of service (crash) via a crafted Edge Side Includes (ESI) response.

Severity
High 7.5
Published
10 May 2016
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
23% in the next 30 daysHigher than 97% of CVEs. EPSS by FIRST, 11 Nov 2026
Attack
Over the network · No login needed · No user action needed
Attacker can
Take it down
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 142 release lines
  • Version 3.0
  • Version 3.1
  • Version 3.1.0.1
  • Version 3.1.0.2
  • Version 3.1.0.3
  • Version 3.1.0.4
  • Version 3.1.0.5
  • Version 3.1.0.6
  • Version 3.1.0.7
  • Version 3.1.0.8
  • Version 3.1.0.9
  • Version 3.1.0.10
  • Version 3.1.0.11
  • Version 3.1.0.12
  • Version 3.1.0.13
  • Version 3.1.0.14
  • Version 3.1.0.15
  • Version 3.1.0.16
  • Version 3.1.0.17
  • Version 3.1.0.18
  • Version 3.1.1
  • Version 3.1.2
  • Version 3.1.3
  • Version 3.1.4
  • Version 3.1.5
  • Version 3.1.5.1
  • Version 3.1.6
  • Version 3.1.7
  • Version 3.1.8
  • Version 3.1.9
  • Version 3.1.10
  • Version 3.1.11
  • Version 3.1.12
  • Version 3.1.12.1
  • Version 3.1.12.2
  • Version 3.1.12.3
  • Version 3.1.13
  • Version 3.1.14
  • Version 3.1.15
  • Version 3.1.16
  • Version 3.1.17
  • Version 3.1.18
  • Version 3.1.19
  • Version 3.1.20
  • Version 3.1.21
  • Version 3.1.22
  • Version 3.2.0.1
  • Version 3.2.0.2
  • Version 3.2.0.3
  • Version 3.2.0.4
  • Version 3.2.0.5
  • Version 3.2.0.6
  • Version 3.2.0.7
  • Version 3.2.0.8
  • Version 3.2.0.9
  • Version 3.2.0.10
  • Version 3.2.0.11
  • Version 3.2.0.12
  • Version 3.2.0.13
  • Version 3.2.0.14
  • Version 3.2.0.15
  • Version 3.2.0.16
  • Version 3.2.0.17
  • Version 3.2.0.18
  • Version 3.2.0.19
  • Version 3.2.1
  • Version 3.2.2
  • Version 3.2.3
  • Version 3.2.4
  • Version 3.2.5
  • Version 3.2.6
  • Version 3.2.7
  • Version 3.2.8
  • Version 3.2.9
  • Version 3.2.10
  • Version 3.2.11
  • Version 3.2.12
  • Version 3.2.13
  • Version 3.3.0
  • Version 3.3.0.1
  • Version 3.3.0.2
  • Version 3.3.0.3
  • Version 3.3.1
  • Version 3.3.2
  • Version 3.3.3
  • Version 3.3.4
  • Version 3.3.5
  • Version 3.3.6
  • Version 3.3.7
  • Version 3.3.8
  • Version 3.3.9
  • Version 3.3.10
  • Version 3.3.11
  • Version 3.3.12
  • Version 3.3.13
  • Version 3.3.14
  • Version 3.4.0.1
  • Version 3.4.0.2
  • Version 3.4.0.3
  • Version 3.4.1
  • Version 3.4.2
  • Version 3.4.3
  • Version 3.4.4
  • Version 3.4.4.1
  • Version 3.4.4.2
  • Version 3.4.8
  • Version 3.4.9
  • Version 3.4.10
  • Version 3.4.11
  • Version 3.4.12
  • Version 3.4.13
  • Version 3.4.14
  • Version 3.5.0.1
  • Version 3.5.0.2
  • Version 3.5.0.3
  • Version 3.5.0.4
  • Version 3.5.1
  • Version 3.5.2
  • Version 3.5.3
  • Version 3.5.4
  • Version 3.5.5
  • Version 3.5.6
  • Version 3.5.7
  • Version 3.5.8
  • Version 3.5.9
  • Version 3.5.10
  • Version 3.5.11
  • Version 3.5.12
  • Version 3.5.13
  • Version 3.5.14
  • Version 3.5.15
  • Version 3.5.16
  • Version 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-2016-4556
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2016-4556