Vulnerability Monitor

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CVE-2015-4050

FragmentListener in the HttpKernel component in Symfony 2.3.19 through 2.3.28, 2.4.9 through 2.4.10, 2.5.4 through 2.5.11, and 2.6.0 through 2.6.7, when ESI or SSI support enabled, does not check if the _controller attribute is set, which allows remote attackers to bypass URL signing and security rules by including (1) no hash or (2) an invalid hash in a request to /_fragment.

Security Impact Summary

CVE-2015-4050 is a security vulnerability that . Impacting 1 product from sensiolabs 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

2015-06-02T14:59:12.253

Last Modified

2025-04-12T10:46:40.837

Status

Deferred

Source

[email protected]

Severity

CVSSv2: 4.3 (MEDIUM)

CVSSv2 Vector

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

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

Exploitability Score

8.6

Impact Score

2.9

Weaknesses

Type: Primary
CWE-284

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	sensiolabs	symfony	2.3.19	Yes
Application	sensiolabs	symfony	2.3.20	Yes
Application	sensiolabs	symfony	2.3.21	Yes
Application	sensiolabs	symfony	2.3.22	Yes
Application	sensiolabs	symfony	2.3.23	Yes
Application	sensiolabs	symfony	2.3.24	Yes
Application	sensiolabs	symfony	2.3.25	Yes
Application	sensiolabs	symfony	2.3.26	Yes
Application	sensiolabs	symfony	2.3.27	Yes
Application	sensiolabs	symfony	2.3.28	Yes
Application	sensiolabs	symfony	2.4.9	Yes
Application	sensiolabs	symfony	2.4.10	Yes
Application	sensiolabs	symfony	2.5.4	Yes
Application	sensiolabs	symfony	2.5.5	Yes
Application	sensiolabs	symfony	2.5.6	Yes
Application	sensiolabs	symfony	2.5.7	Yes
Application	sensiolabs	symfony	2.5.8	Yes
Application	sensiolabs	symfony	2.5.9	Yes
Application	sensiolabs	symfony	2.5.10	Yes
Application	sensiolabs	symfony	2.5.11	Yes
Application	sensiolabs	symfony	2.6.0	Yes
Application	sensiolabs	symfony	2.6.1	Yes
Application	sensiolabs	symfony	2.6.3	Yes
Application	sensiolabs	symfony	2.6.4	Yes
Application	sensiolabs	symfony	2.6.5	Yes
Application	sensiolabs	symfony	2.6.6	Yes
Application	sensiolabs	symfony	2.6.7	Yes

References

http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159513.html ([email protected])
http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159603.html ([email protected])
http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159610.html ([email protected])
http://symfony.com/blog/cve-2015-4050-esi-unauthorized-access Vendor Advisory ([email protected])
http://www.debian.org/security/2015/dsa-3276 ([email protected])
http://www.securityfocus.com/bid/74928 ([email protected])
http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159513.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159603.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159610.html (af854a3a-2127-422b-91ae-364da2661108)
http://symfony.com/blog/cve-2015-4050-esi-unauthorized-access Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.debian.org/security/2015/dsa-3276 (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/74928 (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 sensiolabs'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.