CVE-2011-4121
A remote attacker could use this flaw to bypass or corrupt integrity of services, depending on strong private RSA keys generation mechanism.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.53%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 2.53% probability · 85th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-326
- Affected
- ruby-lang/ruby
- Source
- secalert@redhat.com
EPSS 2.5% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.openwall.com/lists/oss-security/2013/07/01/1Mailing List, Third Party Advisory
- https://access.redhat.com/security/cve/cve-2011-4121Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4121Issue Tracking, Third Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2011-4121Third Party Advisory
- http://www.openwall.com/lists/oss-security/2013/07/01/1Mailing List, Third Party Advisory
- https://access.redhat.com/security/cve/cve-2011-4121Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4121Issue Tracking, Third Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2011-4121Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.