CVE-2011-4121

9.8 criticalEPSS 2.5%

Critical (9.8) in ruby-lang ruby. EPSS 2.5% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 2.5% chance of exploitation in the next 30 days; higher than 84% of CVEs (scores of 2026-10-31)
CWE: CWE-326
Published: 2019-11-26
Modified: 2026-06-16
Record from: the NVD, synced 2026-10-19

Affected

ruby-lang:ruby

References

http://www.openwall.com/lists/oss-security/2013/07/01/1
https://access.redhat.com/security/cve/cve-2011-4121
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4121
https://security-tracker.debian.org/tracker/CVE-2011-4121
http://www.openwall.com/lists/oss-security/2013/07/01/1

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