Is CVE-2011-4121 in the CISA KEV catalog?

No. CVE-2011-4121 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-4121?

CVE-2011-4121 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2011-4121?

CVE-2011-4121 has an EPSS score of 2.53% (83th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2011-4121?

Upgrade Ruby 3.0 to 1.9.3 or later. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2011-4121

CRITICALEPSS 83th pctl

9.8

CVSS v3

NVD

Description

The OpenSSL extension of Ruby (Git trunk) versions after 2011-09-01 up to 2011-11-03 always generated an exponent value of '1' to be used for private RSA key generation. A remote attacker could use this flaw to bypass or corrupt integrity of services, depending on strong private RSA keys generation mechanism.

CWE-326

How to fix

Remediation Available

Ruby 3.0Windows application

Affected:1.8.7.334 1.9.3Fixed in:1.9.3RubyInstaller Team

Ruby 3.1Windows application

Affected:1.8.7.334 1.9.3Fixed in:1.9.3RubyInstaller Team

Ruby 3.2Windows application

Affected:1.8.7.334 1.9.3Fixed in:1.9.3RubyInstaller Team

Ruby 3.2 with MSYS2Windows application

Affected:1.8.7.334 1.9.3Fixed in:1.9.3RubyInstaller Team

Ruby 3.3Windows application

Affected:1.8.7.334 1.9.3Fixed in:1.9.3RubyInstaller Team

Ruby 3.3 with MSYS2Windows application

Affected:1.8.7.334 1.9.3Fixed in:1.9.3RubyInstaller Team

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

2.53%probability of exploitation in 30 days

83rdpercentile

Elevated risk: more likely to be exploited than 83% of all known CVEs.

References

Third-Party Advisory4

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.