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Vulnerability record · CVE-2011-3187 · published 29 August 2011

CVE-2011-3187: Rubyonrails rails improper input validation vulnerability

Rubyonrails · Rails

The to_s method in actionpack/lib/action_dispatch/middleware/remote_ip.rb in Ruby on Rails 3.0.5 does not validate the X-Forwarded-For header in requests from IP addresses on a Class C network, which might allow remote attackers to inject arbitrary text into log files or bypass intended address parsing via a crafted header.

4.3 CVSS 2.0 Medium EPSS 6.7% · top 6.3% CWE-20 · Improper input validation
4.3CVSS 2.0 base score
6.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
18References, 6 tagged exploit
16 Jun 2026Last modified by NVD

Description

The to_s method in actionpack/lib/action_dispatch/middleware/remote_ip.rb in Ruby on Rails 3.0.5 does not validate the X-Forwarded-For header in requests from IP addresses on a Class C network, which might allow remote attackers to inject arbitrary text into log files or bypass intended address parsing via a crafted header.

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

Affected products

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

References

LinkTags
http://archives.neohapsis.com/archives/fulldisclosure/2011-02/0337.html
http://webservsec.blogspot.com/2011/02/ruby-on-rails-vulnerability.html Exploit
http://www.openwall.com/lists/oss-security/2011/08/17/1 Patch
http://www.openwall.com/lists/oss-security/2011/08/19/11 Patch
http://www.openwall.com/lists/oss-security/2011/08/20/1 Patch
http://www.openwall.com/lists/oss-security/2011/08/22/13 Patch
http://www.openwall.com/lists/oss-security/2011/08/22/14 Exploit
http://www.openwall.com/lists/oss-security/2011/08/22/5 Patch
https://bugzilla.novell.com/show_bug.cgi?id=673010 Exploit
http://archives.neohapsis.com/archives/fulldisclosure/2011-02/0337.html
http://webservsec.blogspot.com/2011/02/ruby-on-rails-vulnerability.html Exploit
http://www.openwall.com/lists/oss-security/2011/08/17/1 Patch
http://www.openwall.com/lists/oss-security/2011/08/19/11 Patch
http://www.openwall.com/lists/oss-security/2011/08/20/1 Patch
http://www.openwall.com/lists/oss-security/2011/08/22/13 Patch
http://www.openwall.com/lists/oss-security/2011/08/22/14 Exploit
http://www.openwall.com/lists/oss-security/2011/08/22/5 Patch
https://bugzilla.novell.com/show_bug.cgi?id=673010 Exploit

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2011-3187), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.