CVE-2011-3187

score

<0.1

cvss

4.3

epss

6.7%

published

2011-08-29

kev added

—

first seen

2026-10-21

Ruby on Rails 3.0.5 contains a to_s method in actionpack/lib/action_dispatch/middleware/remote_ip.rb that does not validate the X-Forwarded-For header from Class C network IP addresses, letting remote attackers inject arbitrary text into log files or bypass address parsing via crafted headers, exploit requires sending malicious X-Forwarded-For headers.