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CVE-2009-3086

16
FAUCET Score

CVE-2009-3086 is a vulnerability in Ruby on Rails versions 2.1.0 through 2.2.2, and 2.3.x before 2.3.4, where an algorithm leaks information about the complexity of message-digest signature verification in the cookie store. This information leakage could allow an unauthenticated remote attacker to forge a digest through multiple attempts. The vulnerability has a CVSS score of 5.0, indicating a medium severity, with low attack complexity and potential for information disclosure. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
2.1.0CPE matchmatch criteria
cpe:2.3:a:rubyonrails:rails:2.1.0:*:*:*:*:*:*:*
2.1.1CPE matchmatch criteria
cpe:2.3:a:rubyonrails:rails:2.1.1:*:*:*:*:*:*:*
2.1.2CPE matchmatch criteria
cpe:2.3:a:rubyonrails:rails:2.1.2:*:*:*:*:*:*:*
2.2.0CPE matchmatch criteria
cpe:2.3:a:rubyonrails:rails:2.2.0:*:*:*:*:*:*:*
2.2.1CPE matchmatch criteria
cpe:2.3:a:rubyonrails:rails:2.2.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

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

Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.23%
Probability of exploitation in next 30 days
EPSS Percentile
80.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0223 is in the 71st percentile among its peer group of 23,723 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

rubygemspatch availablevia ghsa
Product: actionpackFixed in: 2.2.3
rubygemspatch availablevia ghsa
Product: activesupportFixed in: 2.3.4
rubygemspatch availablevia ghsa
Product: actionpackFixed in: 2.3.4
rubygemspatch availablevia ghsa
Product: activesupportFixed in: 2.2.3

Vendor Advisories (1)

rubygemsGHSA-fg9w-g6m4-557jmedium

actionpack and activesupport vulnerable to information leaks

Oct 24, 2017

References

lists.opensuse.org / opensuse-security-announce/2009-10/msg00004.html
secunia.com / advisories/36600
weblog.rubyonrails.org / 2009/9/4/timing-weakness-in-ruby-on-rails
Patch
debian.org / security/2011/dsa-2260
securityfocus.com / bid/37427
vupen.com / english/advisories/2009/2544
Vendor Advisory