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Vulnerability record · CVE-2015-5400 · published 28 September 2015

CVE-2015-5400: Fedoraproject fedora permissions and access controls vulnerability

Fedoraproject · Fedora

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.

6.8 CVSS 2.0 Medium EPSS 21% · top 2.5% CWE-264 · Permissions and access controls
6.8CVSS 2.0 base score
21%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
30References, 8 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183598.html
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/2015/dsa-3327
http://www.openwall.com/lists/oss-security/2015/07/06/8
http://www.openwall.com/lists/oss-security/2015/07/09/12
http://www.openwall.com/lists/oss-security/2015/07/10/2
http://www.openwall.com/lists/oss-security/2015/07/17/14 Exploit
http://www.securityfocus.com/bid/75553
http://www.securitytracker.com/id/1032873
http://www.squid-cache.org/Advisories/SQUID-2015_2.txt Vendor Advisory
http://www.squid-cache.org/Versions/v3/3.1/changesets/squid-3.1-10494.patch ExploitVendor Advisory
http://www.squid-cache.org/Versions/v3/3.4/changesets/squid-3.4-13225.patch ExploitVendor Advisory
http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-13856.patch ExploitVendor Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183598.html
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/2015/dsa-3327
http://www.openwall.com/lists/oss-security/2015/07/06/8
http://www.openwall.com/lists/oss-security/2015/07/09/12
http://www.openwall.com/lists/oss-security/2015/07/10/2
http://www.openwall.com/lists/oss-security/2015/07/17/14 Exploit
http://www.securityfocus.com/bid/75553
http://www.securitytracker.com/id/1032873
http://www.squid-cache.org/Advisories/SQUID-2015_2.txt Vendor Advisory
http://www.squid-cache.org/Versions/v3/3.1/changesets/squid-3.1-10494.patch ExploitVendor Advisory
http://www.squid-cache.org/Versions/v3/3.4/changesets/squid-3.4-13225.patch ExploitVendor Advisory
http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-13856.patch ExploitVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2015-5400), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.