CVE-2015-4050

Symfony vulnerability

CVSS

4.3

EPSS

8.3%

EPSS pct

94th

Exploited

No known

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.

Affected vendor

Sensiolabs

Affected product

Symfony

CVSS vector

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

Weakness type (CWE)

CWE-284 — Improper Access Control

Published

2015-06-02

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, medium attack complexity, requiring no authentication. Successful exploitation leads to partial impact to integrity.

Its EPSS score of 8.3% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 94% of all scored CVEs.

Check your external exposure to CVE-2015-4050

Confirm whether Sensiolabs Symfony is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2015-4050.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2015-4050

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2015-4050 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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