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
Published Aug 29, 2011
4.3
MEDIUMCVSS 2.0
EPSS 6.67%
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.
Affected products
No data.
- 3.0.5
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 6.67% (0.06666) | 93.68th | v5 (v2026.06.15) |
| Jun 15, 2026 | 6.66% (0.06661) | 93.00th | v5 (v2026.06.15) |
| Apr 29, 2025 | 9.42% (0.09423) | 92.32th | v4 (v2025.03.14) |
| Mar 30, 2025 | 11.02% (0.11016) | 92.80th | v4 (v2025.03.14) |
| Mar 29, 2025 | 12.63% (0.12629) | 89.92th | v4 (v2025.03.14) |
| Mar 17, 2025 | 11.02% (0.11016) | 92.90th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.69% (0.01685) | 88.20th | v3 (v2023.03.01) |
| Sep 17, 2023 | 1.62% (0.01621) | 85.96th | v3 (v2023.03.01) |
| Jul 25, 2023 | 1.37% (0.01374) | 84.51th | v3 (v2023.03.01) |
| May 28, 2023 | 1.24% (0.01245) | 83.51th | v3 (v2023.03.01) |
| Mar 29, 2023 | 1.35% (0.01346) | 84.07th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.52% (0.01517) | 84.92th | v3 (v2023.03.01) |
| Mar 6, 2023 | 11.00% (0.10995) | 94.86th | v2 (v2022.01.01) |
| Apr 1, 2022 | 11.00% (0.10995) | 94.44th | v2 (v2022.01.01) |
| Feb 4, 2022 | 11.00% (0.10995) | 88.52th | v2 (v2022.01.01) |
References (13)
- http://archives.neohapsis.com/archives/fulldisclosure/2011-02/0337.html mailing-listx_refsource_FULLDISC
- http://webservsec.blogspot.com/2011/02/ruby-on-rails-vulnerability.html x_refsource_MISCExploit
- http://www.openwall.com/lists/oss-security/2011/08/17/1 mailing-listx_refsource_MLISTPatch
- http://www.openwall.com/lists/oss-security/2011/08/19/11 mailing-listx_refsource_MLISTPatch
- http://www.openwall.com/lists/oss-security/2011/08/20/1 mailing-listx_refsource_MLISTPatch
- http://www.openwall.com/lists/oss-security/2011/08/22/13 mailing-listx_refsource_MLISTPatch
- http://www.openwall.com/lists/oss-security/2011/08/22/14 mailing-listx_refsource_MLISTExploit
- http://www.openwall.com/lists/oss-security/2011/08/22/5 mailing-listx_refsource_MLISTPatch
- https://bugzilla.novell.com/show_bug.cgi?id=673010 x_refsource_CONFIRMExploit
- https://github.com/advisories/GHSA-3vfw-7rcp-3xgm Advisory
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2011-3187.yml
- https://nvd.nist.gov/vuln/detail/CVE-2011-3187
- https://web.archive.org/web/20111209181000/http://archives.neohapsis.com/archives/fulldisclosure/2011-02/0337.html
Change history (0)
No recorded changes yet.