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Fencer Vulns
high 8.1

CVE-2016-4054 in the critical feed json

Buffer overflow in Squid 3.x before 3.5.17 and 4.x before 4.0.9 allows remote attackers to execute arbitrary code via crafted Edge Side Inc…

published 2016-04-25 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-5057

cvss
8.1
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
77.6%
EPSS 77.6% chance of exploitation in 30 days, percentile 99.5%
public exploits
0
none known

Summary

Buffer overflow in Squid 3.x before 3.5.17 and 4.x before 4.0.9 allows remote attackers to execute arbitrary code via crafted Edge Side Includes (ESI) responses.

Patch / fix

  • squid3 Ubuntu 14.04 LTS 3.3.8-1ubuntu6.8
  • squid3 Ubuntu 16.04 LTS 3.5.12-1ubuntu7.2

ubuntu advisories UBUNTU-CVE-2016-4054

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • squid RHEL 7 7:3.3.8-26.el7_2.3
  • squid-sysvinit RHEL 7 7:3.3.8-26.el7_2.3
  • squid34 RHEL 6 7:3.4.14-9.el6_8.3
  • squid RHEL 6 7:3.1.23-16.el6_8.4

red hat advisories RHSA-2016:1139RHSA-2016:1140RHSA-2016:1138

  • squid3 SLES for SAP 11 SP4, SLES 11 SP4 3.1.23-8.16.30.1
  • squid SLES for SAP 12 SP1, SLES 12 SP1 3.3.14-20.2

suse advisories SUSE-SU-2016:2089-1SUSE-SU-2016:2008-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-4054 updated cvss 5.1

squid: multiple issues in ESI processing

  • Red Hat Enterprise Linux Server (v. 6) squid 3.1.23-16.el6_8.4, squid34 3.4.14-9.el6_8.3
    fixed: vendor fix RHSA-2016:1138
  • Red Hat Enterprise Linux Server (v. 7) squid 3.3.8-26.el7_2.3 Red Hat Enterprise Linux Server Optional (v. 7) squid-sysvinit 3.3.8-26.el7_2.3
    fixed: vendor fix RHSA-2016:1139
  • Red Hat Enterprise Linux Workstation (v. 6) squid 3.1.23-16.el6_8.4, squid34 3.4.14-9.el6_8.3
    fixed: vendor fix RHSA-2016:1138
  • Red Hat Enterprise Linux Workstation (v. 7) squid 3.3.8-26.el7_2.3 Red Hat Enterprise Linux Workstation Optional (v. 7) squid-sysvinit 3.3.8-26.el7_2.3
    fixed: vendor fix RHSA-2016:1139
  • Red Hat Enterprise Linux 5 squid
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

77.56% chance of exploitation in the next 30 days, higher than 99.5% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 8.1 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.