{
    "id": "CVE-2011-3187",
    "published": "2011-08-29 18:55:01",
    "last_modified": "2026-06-16 23:32:49",
    "cvss_score": "4.3",
    "cvss_severity": "MEDIUM",
    "cvss_version": "2.0",
    "cvss_vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
    "cwe": "CWE-20",
    "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.",
    "epss_score": "0.06666",
    "epss_percentile": "0.93676",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-09-30 18:17:10",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "rubyonrails",
            "product": "rails"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "35352",
            "title": "Ruby on Rails 3.0.5 - 'WEBrick::HTTPRequest' Module HTTP Header Injection",
            "date": "2011-02-16",
            "url": "https://www.exploit-db.com/exploits/35352"
        }
    ],
    "refs_list": [
        "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",
        "https://bugzilla.novell.com/show_bug.cgi?id=673010",
        "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",
        "https://bugzilla.novell.com/show_bug.cgi?id=673010"
    ]
}