Vulnerability Report

CVE-2016-2390

Title: Squid-Cache Squid Denial of Service (DoS)

DoS

Proof Of Concept

No public PoC currently indexed for CVE-2016-2390.

CWE Category CWE-20

Published Date Apr 19, 2016

Modified Date Jun 17, 2026

Exploit Status Not Found

Score 5.9 CVSS v3.0

Exploit Probability (EPSS)

25.55%

Vulnerability Summary

CVE-2016-2390: The FwdState::connectedToPeer method in FwdState.cc in Squid before 3.5.14 and 4.0.x before 4.0.6 does not properly handle SSL handshake errors when built with the --with-openssl option, which allows remote attackers to cause a denial of service (application crash) via a plaintext HTTP message.

Impacted Vendors

squid 1

squid-cache 1

Reference Links

http://bugs.squid-cache.org/show_bug.cgi?id=4437 http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html http://lists.squid-cache.org/pipermail/squid-announce/2016-February/000037.html http://lists.squid-cache.org/pipermail/squid-announce/2016-February/000038.html http://www.securitytracker.com/id/1035045 http://www.squid-cache.org/Advisories/SQUID-2016_1.txt http://bugs.squid-cache.org/show_bug.cgi?id=4437 http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html http://lists.squid-cache.org/pipermail/squid-announce/2016-February/000037.html http://lists.squid-cache.org/pipermail/squid-announce/2016-February/000038.html http://www.securitytracker.com/id/1035045 http://www.squid-cache.org/Advisories/SQUID-2016_1.txt

CVSS v3.0

Source Entity [email protected]

Severity MEDIUM

5.9

Attack Vector

NETWORK

Complexity

HIGH

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

CVSS v2.0

Source Entity [email protected]

Severity MEDIUM

4.3

Access Vector

N/A

Authentication

N/A

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

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2016-2390 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.

April 19, 2016 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity HIGH

Privileges N/A

Interaction NONE

CVSS Vector String


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

Affected Stack

No specific products linked.