Vulnerability Monitor

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CVE-2015-5400

Squid before 3.5.6 does not properly handle CONNECT method peer responses when configured with cache_peer, which allows remote attackers to bypass intended restrictions and gain access to a backend proxy via a CONNECT request.

Security Impact Summary

CVE-2015-5400 is a security vulnerability that . Impacting 3 products from fedoraproject, from debian, from squid-cache organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2015, 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

2015-09-28T20:59:03.280

Last Modified

2026-06-17T00:29:04.243

Status

Modified

Source

[email protected]

Severity

CVSSv2: 6.8 (MEDIUM)

CVSSv2 Vector

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

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

Exploitability Score

8.6

Impact Score

6.4

Weaknesses

Type: Primary
CWE-264

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	fedoraproject	fedora	22	Yes
Operating System	debian	debian_linux	7.0	Yes
Operating System	debian	debian_linux	8.0	Yes
Application	squid-cache	squid	≤ 3.5.2	Yes

References

http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183598.html ([email protected])
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://www.debian.org/security/2015/dsa-3327 ([email protected])
http://www.openwall.com/lists/oss-security/2015/07/06/8 ([email protected])
http://www.openwall.com/lists/oss-security/2015/07/09/12 ([email protected])
http://www.openwall.com/lists/oss-security/2015/07/10/2 ([email protected])
http://www.openwall.com/lists/oss-security/2015/07/17/14 Exploit ([email protected])
http://www.securityfocus.com/bid/75553 ([email protected])
http://www.securitytracker.com/id/1032873 ([email protected])
http://www.squid-cache.org/Advisories/SQUID-2015_2.txt Vendor Advisory ([email protected])
http://www.squid-cache.org/Versions/v3/3.1/changesets/squid-3.1-10494.patch Exploit, Vendor Advisory ([email protected])
http://www.squid-cache.org/Versions/v3/3.4/changesets/squid-3.4-13225.patch Exploit, Vendor Advisory ([email protected])
http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-13856.patch Exploit, Vendor Advisory ([email protected])
http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183598.html (af854a3a-2127-422b-91ae-364da2661108)
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://www.debian.org/security/2015/dsa-3327 (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2015/07/06/8 (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2015/07/09/12 (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2015/07/10/2 (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2015/07/17/14 Exploit (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/75553 (af854a3a-2127-422b-91ae-364da2661108)
http://www.securitytracker.com/id/1032873 (af854a3a-2127-422b-91ae-364da2661108)
http://www.squid-cache.org/Advisories/SQUID-2015_2.txt Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.squid-cache.org/Versions/v3/3.1/changesets/squid-3.1-10494.patch Exploit, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.squid-cache.org/Versions/v3/3.4/changesets/squid-3.4-13225.patch Exploit, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-13856.patch Exploit, Vendor Advisory (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 fedoraproject'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.