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Vulnerability details: VCID-cdnw-t8n1-23ep
Vulnerability ID VCID-cdnw-t8n1-23ep
Aliases CVE-2011-3187
GHSA-3vfw-7rcp-3xgm
Summary Improper Input Validation 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.
Status Published
Exploitability 2.0
Weighted Severity 6.2
Risk 10.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-20 Improper Input Validation
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.09049 https://api.first.org/data/v1/epss?cve=CVE-2011-3187
epss 0.09049 https://api.first.org/data/v1/epss?cve=CVE-2011-3187
epss 0.09049 https://api.first.org/data/v1/epss?cve=CVE-2011-3187
epss 0.09049 https://api.first.org/data/v1/epss?cve=CVE-2011-3187
epss 0.09049 https://api.first.org/data/v1/epss?cve=CVE-2011-3187
epss 0.09049 https://api.first.org/data/v1/epss?cve=CVE-2011-3187
epss 0.09049 https://api.first.org/data/v1/epss?cve=CVE-2011-3187
generic_textual MODERATE https://bugzilla.novell.com/show_bug.cgi?id=673010
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-3vfw-7rcp-3xgm
generic_textual MODERATE https://github.com/rails/rails
generic_textual MODERATE https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2011-3187.yml
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2011-3187
generic_textual MODERATE https://web.archive.org/web/20111209181000/http://archives.neohapsis.com/archives/fulldisclosure/2011-02/0337.html
generic_textual MODERATE http://webservsec.blogspot.com/2011/02/ruby-on-rails-vulnerability.html
generic_textual MODERATE http://www.openwall.com/lists/oss-security/2011/08/17/1
generic_textual MODERATE http://www.openwall.com/lists/oss-security/2011/08/19/11
generic_textual MODERATE http://www.openwall.com/lists/oss-security/2011/08/20/1
generic_textual MODERATE http://www.openwall.com/lists/oss-security/2011/08/22/13
generic_textual MODERATE http://www.openwall.com/lists/oss-security/2011/08/22/14
generic_textual MODERATE http://www.openwall.com/lists/oss-security/2011/08/22/5
Reference id Reference type URL
http://archives.neohapsis.com/archives/fulldisclosure/2011-02/0337.html
https://api.first.org/data/v1/epss?cve=CVE-2011-3187
https://bugzilla.novell.com/show_bug.cgi?id=673010
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-3187
https://github.com/rails/rails
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2011-3187.yml
https://web.archive.org/web/20111209181000/http://archives.neohapsis.com/archives/fulldisclosure/2011-02/0337.html
http://webservsec.blogspot.com/2011/02/ruby-on-rails-vulnerability.html
http://www.openwall.com/lists/oss-security/2011/08/17/1
http://www.openwall.com/lists/oss-security/2011/08/19/11
http://www.openwall.com/lists/oss-security/2011/08/20/1
http://www.openwall.com/lists/oss-security/2011/08/22/13
http://www.openwall.com/lists/oss-security/2011/08/22/14
http://www.openwall.com/lists/oss-security/2011/08/22/5
CVE-2011-3187 https://nvd.nist.gov/vuln/detail/CVE-2011-3187
CVE-2011-3187;OSVDB-73733 Exploit https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/multiple/remote/35352.rb
CVE-2011-3187;OSVDB-73733 Exploit https://www.securityfocus.com/bid/46423/info
GHSA-3vfw-7rcp-3xgm https://github.com/advisories/GHSA-3vfw-7rcp-3xgm
Data source Exploit-DB
Date added Feb. 16, 2011
Description Ruby on Rails 3.0.5 - 'WEBrick::HTTPRequest' Module HTTP Header Injection
Ransomware campaign use Known
Source publication date Feb. 16, 2011
Exploit type remote
Platform multiple
Source update date Nov. 24, 2014
Source URL https://www.securityfocus.com/bid/46423/info
Exploit Prediction Scoring System (EPSS)
Percentile 0.92606
EPSS Score 0.09049
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:47:25.613368+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/gem/actionpack/CVE-2011-3187.yml 38.0.0