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Fencer Intel
high 7.5

CVE-2016-10003 json

Incorrect HTTP Request header comparison in Squid HTTP Proxy 3.5.0.1 through 3.5.22, and 4.0.1 through 4.0.16 results in Collapsed Forwardi…

published 2017-01-27 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-1201

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.8%
EPSS 4.8% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

Incorrect HTTP Request header comparison in Squid HTTP Proxy 3.5.0.1 through 3.5.22, and 4.0.1 through 4.0.16 results in Collapsed Forwarding feature mistakenly identifying some private responses as being suitable for delivery to multiple clients.

Patch / fix

  • squid-cache squid 3.5.23, 4.0.17
  • squid3 Ubuntu 16.04 LTS 3.5.12-1ubuntu7.3

ubuntu advisories UBUNTU-CVE-2016-10003

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 SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 3.5.21-25.1

suse advisories SUSE-SU-2017:0128-1

  • 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-2016-10003

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-2016-10003 updated cvss 3.7

squid: Information disclosure in Collapsed forwarding

  • Red Hat Enterprise Linux 5 squid Red Hat Enterprise Linux 7 squid, squid-sysvinit, squid-migration-script
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 6 squid, squid34
    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

4.77% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/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

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.