Skip to content
Fencer Intel
low 2.6

CVE-2015-3455 json

Squid 3.2.x before 3.2.14, 3.3.x before 3.3.14, 3.4.x before 3.4.13, and 3.5.x before 3.5.4, when configured with client-first SSL-bump, do…

published 11y ago modified 4mo ago also EUVD-2015-3498

cvss
2.6
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
11.4%
EPSS 11.4% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

Summary

Squid 3.2.x before 3.2.14, 3.3.x before 3.3.14, 3.4.x before 3.4.13, and 3.5.x before 3.5.4, when configured with client-first SSL-bump, do not properly validate the domain or hostname fields of X.509 certificates, which allows man-in-the-middle attackers to spoof SSL servers via a valid certificate.

Patch / fix

  • squid Debian 14, Debian 13, Debian 12 4.1-1

debian advisories DEBIAN-CVE-2015-3455

  • squid3 Ubuntu 14.04 LTS 3.3.8-1ubuntu6.6

ubuntu advisories UBUNTU-CVE-2015-3455

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
  • squid-sysvinit RHEL 7 7:3.3.8-26.el7

red hat advisories RHSA-2015:2378

  • squid SLES for SAP 12 SP1, SLES 12 SP1 3.3.14-20.2

suse advisories SUSE-SU-2016:2008-1

Is CVE-2015-3455 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

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-2015-3455 updated cvss 5.8

squid: incorrect X509 server certificate validation (SQUID-2015:1)

  • Red Hat Enterprise Linux Server (v. 7) squid 3.3.8-26.el7 Red Hat Enterprise Linux Server Optional (v. 7) squid-sysvinit 3.3.8-26.el7 Red Hat Enterprise Linux Workstation (v. 7) squid 3.3.8-26.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) squid-sysvinit 3.3.8-26.el7
    fixed: vendor fix RHSA-2015:2378
  • Red Hat Enterprise Linux 5 squid Red Hat Enterprise Linux 6 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

11.40% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 2.6 AV:N/AC:H/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel 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.