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Fencer Intel
high 7.5

CVE-2016-10002 json

Incorrect processing of responses to If-None-Modified HTTP conditional requests in Squid HTTP Proxy 3.1.10 through 3.1.23, 3.2.0.3 through…

published 2017-01-27 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-1200

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
7.0%
EPSS 7.0% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

Incorrect processing of responses to If-None-Modified HTTP conditional requests in Squid HTTP Proxy 3.1.10 through 3.1.23, 3.2.0.3 through 3.5.22, and 4.0.1 through 4.0.16 leads to client-specific Cookie data being leaked to other clients. Attack requests can easily be crafted by a client to probe a cache for this information.

Patch / fix

  • squid3 Ubuntu 14.04 LTS 3.3.8-1ubuntu6.9
  • squid3 Ubuntu 16.04 LTS 3.5.12-1ubuntu7.3

ubuntu advisories UBUNTU-CVE-2016-10002

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

  • squid34 RHEL 6 7:3.4.14-9.el6_8.4
  • squid RHEL 7 7:3.5.20-2.el7_3.2
  • squid-sysvinit RHEL 7 7:3.5.20-2.el7_3.2
  • squid-migration-script RHEL 7 7:3.5.20-2.el7_3.2

red hat advisories RHSA-2017:0183RHSA-2017:0182

  • squid SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 3.5.21-25.1
  • squid SLES for SAP 12 SP1, SLES 12 SP1 3.3.14-22.6.1
  • squid3 SLES for SAP 11 SP4, SLES 11 SP4 3.1.23-8.16.36.1

suse advisories SUSE-SU-2017:0128-1SUSE-SU-2017:0116-1SUSE-SU-2017:0110-1

  • squid openSUSE Tumbleweed 4.16-1.5

opensuse advisories openSUSE-SU-2024:11403-1

  • squid Alpine 3.3, Alpine 3.2 3.5.23-r0

alpine advisories ALPINE-CVE-2016-10002

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2016-10002 updated cvss 5.3

squid: Information disclosure in HTTP request processing

  • Red Hat Enterprise Linux 6 squid
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Server (v. 6) squid34 3.4.14-9.el6_8.4
    fixed: vendor fix RHSA-2017:0183
  • Red Hat Enterprise Linux Server (v. 7) squid 3.5.20-2.el7_3.2, squid-migration-script 3.5.20-2.el7_3.2 Red Hat Enterprise Linux Server Optional (v. 7) squid-sysvinit 3.5.20-2.el7_3.2
    fixed: vendor fix RHSA-2017:0182
  • Red Hat Enterprise Linux Workstation (v. 6) squid34 3.4.14-9.el6_8.4
    fixed: vendor fix RHSA-2017:0183
  • Red Hat Enterprise Linux Workstation (v. 7) squid 3.5.20-2.el7_3.2, squid-migration-script 3.5.20-2.el7_3.2 Red Hat Enterprise Linux Workstation Optional (v. 7) squid-sysvinit 3.5.20-2.el7_3.2
    fixed: vendor fix RHSA-2017:0182
  • 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

7.04% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

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.