Is CVE-2011-3186 in the CISA KEV catalog?

No. CVE-2011-3186 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-3186?

CVE-2011-3186 has a CVSS v2 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2011-3186?

CVE-2011-3186 has an EPSS score of 1.75% (75th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2011-3186?

Upgrade rails on debian 11 to 2.3.14 or later.

CVE & CISA-KEV Catalog

CVE-2011-3186

MEDIUMEPSS 75th pctl

4.3

CVSS v2

NVD

Description

CRLF injection vulnerability in actionpack/lib/action_controller/response.rb in Ruby on Rails 2.3.x before 2.3.13 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via the Content-Type header.

CWE-94Code Injection

How to fix

Remediation Available

railsDebian

Fixed in:2.3.14CVE-2011-3186

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

1.75%probability of exploitation in 30 days

75thpercentile

Elevated risk: more likely to be exploited than 75% of all known CVEs.

References

Patch8

Other references4

Related Vulnerabilities

Other CWE-94 (Code Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-9841	Critical	9.8	100%	KEV	Fix
CVE-2015-1635	Critical	9.8	100%	KEV	-
CVE-2022-22954	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-22204	Medium	6.8	100%	KEV	Fix
CVE-2025-3248	Critical	9.8	100%	KEV	Fix
CVE-2012-0158	High	8.8	100%	KEV	-

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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 2026-04-29.