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CVE-2009-4123

22
FAUCET Score

CVE-2009-4123 describes a critical vulnerability in the jruby-openssl gem prior to version 0.6, affecting JRuby environments, where it fails to properly validate SSL certificates. This flaw allows an unauthenticated attacker to remotely compromise confidentiality with high impact, as indicated by its CVSS score of 7.5 (High) and a CWE-295 classification. Despite its severity, there is no known active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.6CPE matchmatch criteria
cpe:2.3:a:jruby:jruby-openssl:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.60%
Probability of exploitation in next 30 days
EPSS Percentile
45.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0060 is in the 22nd percentile among its peer group of 51,551 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

rubygemspatch availablevia ghsa
Product: jruby-opensslFixed in: 0.6
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

rubygemsGHSA-xgv7-pqqh-h2w9high

jruby-openssl gem for JRuby fails to do proper certificate validation

Jan 19, 2023

References

jruby.org / 2009/12/07/vulnerability-in-jruby-openssl
Broken Link
github.com / advisories/GHSA-xgv7-pqqh-h2w9
Vendor Advisory
github.com / rubysec/ruby-advisory-db/blob/master/gems/jruby-openssl/CVE-2009-4123.yml
Vendor Advisory
web.archive.org / web/20101213091125/http://jruby.org/2009/12/07/vulnerability-in-jruby-openssl
Vendor Advisory