extension): Insecure way of creation exponent value by private RSA key generation
Published Nov 26, 2019
9.8
CRITICALCVSS 3.1
EPSS 2.53%
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.
Affected products
-
- Version versions after 2011-09-01 up to 2011-11-03StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| OpenSSL | OpenSSL extension of Ruby (Git trunk) | n/a |
|
No data.
Red Hat Enterprise Linux 4
ruby
Not affected
Red Hat Enterprise Linux 5
ruby
Not affected
Red Hat Enterprise Linux 6
ruby
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | ruby | Not affected | n/a |
| Red Hat Enterprise Linux 5 | ruby | Not affected | n/a |
| Red Hat Enterprise Linux 6 | ruby | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.53% (0.02529) | 84.34th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.53% (0.02529) | 82.79th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.20% (0.00200) | 40.06th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.58% (0.00581) | 78.81th | v3 (v2023.03.01) |
| May 4, 2024 | 1.32% (0.01324) | 85.89th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.32% (0.01324) | 83.89th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 17, 2023 | 1.21% (0.01213) | 66.22th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.21% (0.01213) | 64.21th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.21% (0.01213) | 40.54th | v2 (v2022.01.01) |
References (8)
- http://www.openwall.com/lists/oss-security/2013/07/01/1 x_refsource_MISCMailing ListThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2011-4121 Vendor Advisory
- https://access.redhat.com/security/cve/cve-2011-4121 x_refsource_MISCThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=751800 Issue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4121 x_refsource_MISCIssue TrackingThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2011-4121
- https://security-tracker.debian.org/tracker/CVE-2011-4121 x_refsource_MISCThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2011-4121
| Link | Providers | Tags |
|---|---|---|
| http://www.openwall.com/lists/oss-security/2013/07/01/1 | x_refsource_MISCMailing ListThird Party Advisory | |
| https://access.redhat.com/security/cve/CVE-2011-4121 | Vendor Advisory | |
| https://access.redhat.com/security/cve/cve-2011-4121 | x_refsource_MISCThird Party Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=751800 | Issue Tracking | |
| https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4121 | x_refsource_MISCIssue TrackingThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2011-4121 | ||
| https://security-tracker.debian.org/tracker/CVE-2011-4121 | x_refsource_MISCThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2011-4121 |
Change history (0)
No recorded changes yet.