Vulnerability Monitor

The vendors, products, and vulnerabilities you care about

CVE-2016-2571

http.cc in Squid 3.x before 3.5.15 and 4.x before 4.0.7 proceeds with the storage of certain data after a response-parsing failure, which allows remote HTTP servers to cause a denial of service (assertion failure and daemon exit) via a malformed response.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.5, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 1 product from squid-cache organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2016, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2016-02-27T05:59:05.797

Last Modified

2025-04-12T10:46:40.837

Status

Deferred

Source

[email protected]

Severity

CVSSv3.0: 7.5 (HIGH)

CVSSv2 Vector

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

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Primary
CWE-20

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	squid-cache	squid	3.0	Yes
Application	squid-cache	squid	3.0	Yes
Application	squid-cache	squid	3.0	Yes
Application	squid-cache	squid	3.0	Yes
Application	squid-cache	squid	3.0	Yes
Application	squid-cache	squid	3.0	Yes
Application	squid-cache	squid	3.0	Yes
Application	squid-cache	squid	3.0	Yes
Application	squid-cache	squid	3.0	Yes
Application	squid-cache	squid	3.0.stable1	Yes
Application	squid-cache	squid	3.0.stable2	Yes
Application	squid-cache	squid	3.0.stable3	Yes
Application	squid-cache	squid	3.0.stable4	Yes
Application	squid-cache	squid	3.0.stable5	Yes
Application	squid-cache	squid	3.0.stable6	Yes
Application	squid-cache	squid	3.0.stable7	Yes
Application	squid-cache	squid	3.0.stable8	Yes
Application	squid-cache	squid	3.0.stable9	Yes
Application	squid-cache	squid	3.0.stable10	Yes
Application	squid-cache	squid	3.0.stable11	Yes
Application	squid-cache	squid	3.0.stable11	Yes
Application	squid-cache	squid	3.0.stable12	Yes
Application	squid-cache	squid	3.0.stable13	Yes
Application	squid-cache	squid	3.0.stable14	Yes
Application	squid-cache	squid	3.0.stable15	Yes
Application	squid-cache	squid	3.0.stable16	Yes
Application	squid-cache	squid	3.0.stable16	Yes
Application	squid-cache	squid	3.0.stable17	Yes
Application	squid-cache	squid	3.0.stable18	Yes
Application	squid-cache	squid	3.0.stable19	Yes
Application	squid-cache	squid	3.0.stable20	Yes
Application	squid-cache	squid	3.0.stable21	Yes
Application	squid-cache	squid	3.0.stable22	Yes
Application	squid-cache	squid	3.0.stable23	Yes
Application	squid-cache	squid	3.0.stable24	Yes
Application	squid-cache	squid	3.0.stable25	Yes
Application	squid-cache	squid	3.1	Yes
Application	squid-cache	squid	3.1.0.1	Yes
Application	squid-cache	squid	3.1.0.2	Yes
Application	squid-cache	squid	3.1.0.3	Yes
Application	squid-cache	squid	3.1.0.4	Yes
Application	squid-cache	squid	3.1.0.5	Yes
Application	squid-cache	squid	3.1.0.6	Yes
Application	squid-cache	squid	3.1.0.7	Yes
Application	squid-cache	squid	3.1.0.8	Yes
Application	squid-cache	squid	3.1.0.9	Yes
Application	squid-cache	squid	3.1.0.10	Yes
Application	squid-cache	squid	3.1.0.11	Yes
Application	squid-cache	squid	3.1.0.12	Yes
Application	squid-cache	squid	3.1.0.13	Yes
Application	squid-cache	squid	3.1.0.14	Yes
Application	squid-cache	squid	3.1.0.15	Yes
Application	squid-cache	squid	3.1.0.16	Yes
Application	squid-cache	squid	3.1.0.17	Yes
Application	squid-cache	squid	3.1.0.18	Yes
Application	squid-cache	squid	3.1.1	Yes
Application	squid-cache	squid	3.1.2	Yes
Application	squid-cache	squid	3.1.3	Yes
Application	squid-cache	squid	3.1.4	Yes
Application	squid-cache	squid	3.1.5	Yes
Application	squid-cache	squid	3.1.5.1	Yes
Application	squid-cache	squid	3.1.6	Yes
Application	squid-cache	squid	3.1.7	Yes
Application	squid-cache	squid	3.1.8	Yes
Application	squid-cache	squid	3.1.9	Yes
Application	squid-cache	squid	3.1.10	Yes
Application	squid-cache	squid	3.1.11	Yes
Application	squid-cache	squid	3.1.12	Yes
Application	squid-cache	squid	3.1.13	Yes
Application	squid-cache	squid	3.1.14	Yes
Application	squid-cache	squid	3.1.15	Yes
Application	squid-cache	squid	3.2.0.1	Yes
Application	squid-cache	squid	3.2.0.2	Yes
Application	squid-cache	squid	3.2.0.3	Yes
Application	squid-cache	squid	3.2.0.4	Yes
Application	squid-cache	squid	3.2.0.5	Yes
Application	squid-cache	squid	3.2.0.6	Yes
Application	squid-cache	squid	3.2.0.7	Yes
Application	squid-cache	squid	3.2.0.8	Yes
Application	squid-cache	squid	3.2.0.9	Yes
Application	squid-cache	squid	3.2.0.10	Yes
Application	squid-cache	squid	3.2.0.11	Yes
Application	squid-cache	squid	3.2.0.12	Yes
Application	squid-cache	squid	3.2.0.13	Yes
Application	squid-cache	squid	3.2.0.14	Yes
Application	squid-cache	squid	3.2.0.15	Yes
Application	squid-cache	squid	3.2.0.16	Yes
Application	squid-cache	squid	3.2.0.17	Yes
Application	squid-cache	squid	3.2.0.18	Yes
Application	squid-cache	squid	3.2.0.19	Yes
Application	squid-cache	squid	3.2.1	Yes
Application	squid-cache	squid	3.2.2	Yes
Application	squid-cache	squid	3.2.3	Yes
Application	squid-cache	squid	3.2.4	Yes
Application	squid-cache	squid	3.2.5	Yes
Application	squid-cache	squid	3.2.6	Yes
Application	squid-cache	squid	3.2.7	Yes
Application	squid-cache	squid	3.2.8	Yes
Application	squid-cache	squid	3.2.9	Yes
Application	squid-cache	squid	3.2.10	Yes
Application	squid-cache	squid	3.2.11	Yes
Application	squid-cache	squid	3.2.12	Yes
Application	squid-cache	squid	3.2.13	Yes
Application	squid-cache	squid	3.3.0	Yes
Application	squid-cache	squid	3.3.0.2	Yes
Application	squid-cache	squid	3.3.0.3	Yes
Application	squid-cache	squid	3.3.1	Yes
Application	squid-cache	squid	3.3.2	Yes
Application	squid-cache	squid	3.3.3	Yes
Application	squid-cache	squid	3.3.4	Yes
Application	squid-cache	squid	3.3.5	Yes
Application	squid-cache	squid	3.3.6	Yes
Application	squid-cache	squid	3.3.7	Yes
Application	squid-cache	squid	3.3.8	Yes
Application	squid-cache	squid	3.3.9	Yes
Application	squid-cache	squid	3.3.10	Yes
Application	squid-cache	squid	3.3.11	Yes
Application	squid-cache	squid	3.3.12	Yes
Application	squid-cache	squid	3.3.13	Yes
Application	squid-cache	squid	3.4.0.1	Yes
Application	squid-cache	squid	3.4.0.2	Yes
Application	squid-cache	squid	3.4.0.3	Yes
Application	squid-cache	squid	3.4.1	Yes
Application	squid-cache	squid	3.4.2	Yes
Application	squid-cache	squid	3.4.3	Yes
Application	squid-cache	squid	3.4.4	Yes
Application	squid-cache	squid	3.4.8	Yes
Application	squid-cache	squid	3.4.9	Yes
Application	squid-cache	squid	3.4.10	Yes
Application	squid-cache	squid	3.4.11	Yes
Application	squid-cache	squid	3.4.12	Yes
Application	squid-cache	squid	3.4.13	Yes
Application	squid-cache	squid	3.5.0.1	Yes
Application	squid-cache	squid	3.5.0.2	Yes
Application	squid-cache	squid	3.5.0.3	Yes
Application	squid-cache	squid	3.5.0.4	Yes
Application	squid-cache	squid	3.5.1	Yes
Application	squid-cache	squid	4.0.1	Yes
Application	squid-cache	squid	4.0.2	Yes
Application	squid-cache	squid	4.0.3	Yes
Application	squid-cache	squid	4.0.4	Yes
Application	squid-cache	squid	4.0.5	Yes
Application	squid-cache	squid	4.0.6	Yes

References

http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html ([email protected])
http://lists.opensuse.org/opensuse-updates/2016-08/msg00069.html ([email protected])
http://rhn.redhat.com/errata/RHSA-2016-2600.html ([email protected])
http://www.debian.org/security/2016/dsa-3522 ([email protected])
http://www.openwall.com/lists/oss-security/2016/02/26/2 ([email protected])
http://www.securitytracker.com/id/1035101 ([email protected])
http://www.squid-cache.org/Advisories/SQUID-2016_2.txt Vendor Advisory ([email protected])
http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-13990.patch ([email protected])
http://www.squid-cache.org/Versions/v4/changesets/squid-4-14548.patch ([email protected])
http://www.ubuntu.com/usn/USN-2921-1 ([email protected])
https://security.gentoo.org/glsa/201607-01 ([email protected])
https://usn.ubuntu.com/3557-1/ ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-updates/2016-08/msg00069.html (af854a3a-2127-422b-91ae-364da2661108)
http://rhn.redhat.com/errata/RHSA-2016-2600.html (af854a3a-2127-422b-91ae-364da2661108)
http://www.debian.org/security/2016/dsa-3522 (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2016/02/26/2 (af854a3a-2127-422b-91ae-364da2661108)
http://www.securitytracker.com/id/1035101 (af854a3a-2127-422b-91ae-364da2661108)
http://www.squid-cache.org/Advisories/SQUID-2016_2.txt Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-13990.patch (af854a3a-2127-422b-91ae-364da2661108)
http://www.squid-cache.org/Versions/v4/changesets/squid-4-14548.patch (af854a3a-2127-422b-91ae-364da2661108)
http://www.ubuntu.com/usn/USN-2921-1 (af854a3a-2127-422b-91ae-364da2661108)
https://security.gentoo.org/glsa/201607-01 (af854a3a-2127-422b-91ae-364da2661108)
https://usn.ubuntu.com/3557-1/ (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For squid-cache's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.