CVE-2011-3009

Ruby before 1.8.6-p114 does not reset the random seed upon forking, which makes it easier for context-dependent attackers to predict the values of random numbers by leveraging knowledge of the number sequence obtained in a different child process, a related issue to CVE-2003-0900.

Published: 2011-08-05 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-3009 is rated Moderate Risk (47.7/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.09%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2011-3009

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-18 2.05% 2.09% +0.04%
2 2026-06-15 0.50% 2.05% +1.55%
3 2025-12-28 — 0.50% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-3009

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2011-3009

OS Trackers for CVE-2011-3009

vendor priority summary link
redhat low — https://access.redhat.com/security/cve/CVE-2011-3009
ubuntu medium CVE-2011-3009 medium priority: Ubuntu including 1 source packages (ruby1.8), 6 status rows across 6 suites (hardy, lucid, maverick, natty, oneiric, upstream): not-affected 4, ignored 1, needs-triage 1. https://ubuntu.com/security/CVE-2011-3009

Affected software / configurations for CVE-2011-3009

Vendor Product Version Raw CPE
ruby-lang ruby <= 1.8.6 cpe:2.3:a:ruby-lang:ruby:*:p111:*:*:*:*:*:*
ruby-lang ruby 1.8.6 cpe:2.3:a:ruby-lang:ruby:1.8.6:p110:*:*:*:*:*:*
ruby-lang ruby 1.8.6 cpe:2.3:a:ruby-lang:ruby:1.8.6:p36:*:*:*:*:*:*

References for CVE-2011-3009

cvelogic Threat Intelligence