Yubico PAM Module before 2.10 performed user authentication when 'use_first_pass' PAM configuration option was not used and the module was configured as 'sufficient' in the PAM configuration
Published Nov 26, 2019
9.8
CRITICALCVSS 3.1
EPSS 2.02%
Description
Yubico PAM Module before 2.10 performed user authentication when 'use_first_pass' PAM configuration option was not used and the module was configured as 'sufficient' in the PAM configuration. A remote attacker could use this flaw to circumvent common authentication process and obtain access to the account in question by providing a NULL value (pressing Ctrl-D keyboard sequence) as the password string.
Affected products
-
- Version before 2.10StatusaffectedConstraints-
- 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 | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Yubico-Pam | Yubico-Pam | n/a |
|
Configuration 1
- < 2.10
Running on/with
- n/a
Configuration 2
- 8.0
- 9.0
- 10.0
No data.
No Red Hat product state for this CVE.
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 (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.02% (0.02019) | 80.22th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.02% (0.02019) | 78.33th | v5 (v2026.06.15) |
| Mar 30, 2025 | 1.77% (0.01769) | 80.99th | v4 (v2025.03.14) |
| Mar 29, 2025 | 4.15% (0.04145) | 80.76th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.77% (0.01769) | 81.41th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.77% (0.00774) | 81.99th | v3 (v2023.03.01) |
| May 8, 2024 | 1.53% (0.01533) | 87.00th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.53% (0.01533) | 85.00th | 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 (4)
- https://access.redhat.com/security/cve/cve-2011-4120 x_refsource_MISCBroken LinkThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4120 x_refsource_MISCIssue TrackingPatchThird Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2011-4120 x_refsource_MISCThird Party Advisory
- https://www.openwall.com/lists/oss-security/2011/11/07/6 x_refsource_MISCMailing ListThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/cve-2011-4120 | x_refsource_MISCBroken LinkThird Party Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4120 | x_refsource_MISCIssue TrackingPatchThird Party Advisory | |
| https://security-tracker.debian.org/tracker/CVE-2011-4120 | x_refsource_MISCThird Party Advisory | |
| https://www.openwall.com/lists/oss-security/2011/11/07/6 | x_refsource_MISCMailing ListThird Party Advisory |
Change history (0)
No recorded changes yet.