Is CVE-2015-4050 in the CISA KEV catalog?

No. CVE-2015-4050 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-4050?

CVE-2015-4050 has a CVSS v2 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2015-4050?

CVE-2015-4050 has an EPSS score of 8.27% (94th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-4050?

Upgrade symfony on debian 11 to 2.7.0~beta2+dfsg-2 or later.

CVE & CISA-KEV Catalog

CVE-2015-4050

MEDIUMEPSS 94th pctl

4.3

CVSS v2

NVD

Description

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.

CWE-284Improper Access Control

How to fix

Remediation Available

symfonyDebian

Fixed in:2.7.0~beta2+dfsg-2CVE-2015-4050

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

8.27%probability of exploitation in 30 days

94thpercentile

High risk: more likely to be exploited than 94% of all known CVEs.

References

Vendor Advisory1

symfony.com

Other references5

Related Vulnerabilities

Other CWE-284 (Improper Access Control) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-27350	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2019-1653	High	7.5	100%	KEV	-
CVE-2023-23752	Medium	5.3	100%	KEV	Fix
CVE-2023-29298	High	7.5	100%	KEV	-
CVE-2023-38205	High	7.5	100%	KEV	-
CVE-2024-27348	Critical	9.8	99%	KEV	Fix

Embed a live status badge for CVE-2015-4050

Markdown

[![CVE-2015-4050](https://tridentstack.com/cve/badge/CVE-2015-4050.svg)](https://tridentstack.com/cve/CVE-2015-4050)

HTML

<a href="https://tridentstack.com/cve/CVE-2015-4050"><img src="https://tridentstack.com/cve/badge/CVE-2015-4050.svg" alt="CVE-2015-4050"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.