Vulnerability Report

CVE-2016-4553

Title: Squid-Cache Squid

Other

Proof Of Concept

No public PoC currently indexed for CVE-2016-4553.

CWE Category CWE-345

Published Date May 10, 2016

Modified Date Jun 17, 2026

Exploit Status Not Found

Score 8.6 CVSS v3.0

Exploit Probability (EPSS)

79.97%

Vulnerability Summary

CVE-2016-4553: client_side.cc in Squid before 3.5.18 and 4.x before 4.0.10 does not properly ignore the Host header when absolute-URI is provided, which allows remote attackers to conduct cache-poisoning attacks via an HTTP request.

Impacted Vendors

squid 1

squid-cache 1

Reference Links

http://bugs.squid-cache.org/show_bug.cgi?id=4501 http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html http://lists.opensuse.org/opensuse-updates/2016-08/msg00069.html http://www.debian.org/security/2016/dsa-3625 http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html http://www.securitytracker.com/id/1035768 http://www.squid-cache.org/Advisories/SQUID-2016_7.txt http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-14039.patch http://www.ubuntu.com/usn/USN-2995-1 https://access.redhat.com/errata/RHSA-2016:1139 https://access.redhat.com/errata/RHSA-2016:1140 https://security.gentoo.org/glsa/201607-01 http://bugs.squid-cache.org/show_bug.cgi?id=4501 http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html http://lists.opensuse.org/opensuse-updates/2016-08/msg00069.html http://www.debian.org/security/2016/dsa-3625 http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html http://www.securitytracker.com/id/1035768 http://www.squid-cache.org/Advisories/SQUID-2016_7.txt http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-14039.patch http://www.ubuntu.com/usn/USN-2995-1 https://access.redhat.com/errata/RHSA-2016:1139 https://access.redhat.com/errata/RHSA-2016:1140 https://security.gentoo.org/glsa/201607-01

CVSS v3.0

Source Entity [email protected]

Severity HIGH

8.6

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

CHANGED

RAW VECTOR CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

CVSS v2.0

Source Entity [email protected]

Severity MEDIUM

5.0

Access Vector

N/A

Authentication

N/A

RAW VECTOR AV:N/AC:L/Au:N/C:N/I:P/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2016-4553 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

June 17, 2026 MODIFIED

Vulnerability data updated via NVD.

May 06, 2026 MODIFIED

Vulnerability data updated via NVD.

April 12, 2025 MODIFIED

Vulnerability data or affected products updated.

May 10, 2016 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

Affected Stack

No specific products linked.