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CVE-2011-3009

19
FAUCET Score

CVE-2011-3009 affects Ruby versions prior to 1.8.6-p114, where the random number generator's seed was not reset after a process forked. This oversight allowed attackers to predict subsequent random numbers by observing sequences from other child processes. With a CVSS score of 5.0, this vulnerability is of medium severity, requiring no authentication and having a low attack complexity to achieve partial confidentiality impact. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.8.6CPE matchmatch criteria
cpe:2.3:a:ruby-lang:ruby:*:p111:*:*:*:*:*:*
1.8.6CPE matchmatch criteria
cpe:2.3:a:ruby-lang:ruby:1.8.6:p110:*:*:*:*:*:*
1.8.6CPE matchmatch criteria
cpe:2.3:a:ruby-lang:ruby:1.8.6:p36:*:*:*:*:*:*

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
2.09%
Probability of exploitation in next 30 days
EPSS Percentile
79.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0209 is in the 68th 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 (3)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: ruby-0:1.8.1-18.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: ruby-0:1.8.5-22.el5_7.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: ruby-0:1.8.7.352-3.el6
View patch

Vendor Advisories (1)

redhatCVE-2011-3009Low

ruby: Properly initialize the random number generator when forking new process

Jul 2, 2011

References

redmine.ruby-lang.org / issues/show/4338
rhn.redhat.com / errata/RHSA-2012-0070.html
exchange.xforce.ibmcloud.com / vulnerabilities/69157
openwall.com / lists/oss-security/2011/07/20/1
Patch
redhat.com / support/errata/RHSA-2011-1581.html
securityfocus.com / bid/49126