mod_nss: FakeBasicAuth authentication bypass
Published Feb 15, 2018
9.8
CRITICALCVSS 3.0
EPSS 1.00%
Description
Authentication bypass vulnerability in mod_nss 1.0.8 allows remote attackers to assume the identity of a valid user by using their certificate and entering 'password' as the password.
Affected products
No data.
- 1.0.8
No data.
Red Hat Enterprise Linux 5
mod_nss-0:1.0.8-7.el5
Fixed · RHBA-2013:0009
Red Hat Enterprise Linux 6
mod_nss-0:1.0.8-13.el6
Fixed · RHBA-2011:1656
Red Hat Certificate System 8
mod_nss
Affected
Red Hat Directory Server 8
fortitude-mod_nss
Affected
Red Hat Enterprise Linux 7
mod_nss
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | mod_nss-0:1.0.8-7.el5 | Fixed | RHBA-2013:0009 |
| Red Hat Enterprise Linux 6 | mod_nss-0:1.0.8-13.el6 | Fixed | RHBA-2011:1656 |
| Red Hat Certificate System 8 | mod_nss | Affected | n/a |
| Red Hat Directory Server 8 | fortitude-mod_nss | Affected | n/a |
| Red Hat Enterprise Linux 7 | mod_nss | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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 (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.00% (0.00999) | 61.42th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.03% (0.01034) | 59.24th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.16% (0.00162) | 34.61th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.30% (0.00304) | 70.54th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.30% (0.00304) | 68.88th | v3 (v2023.03.01) |
| Jan 26, 2024 | 0.30% (0.00304) | 66.61th | v3 (v2023.03.01) |
| Jul 9, 2023 | 0.43% (0.00432) | 71.06th | v3 (v2023.03.01) |
| Mar 16, 2023 | 0.42% (0.00416) | 70.05th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.29% (0.00293) | 64.27th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.05% (0.01055) | 52.13th | v2 (v2022.01.01) |
| Feb 13, 2023 | 1.05% (0.01055) | 51.58th | v2 (v2022.01.01) |
| Feb 3, 2023 | 1.02% (0.01018) | 39.95th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.05% (0.01055) | 50.47th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.05% (0.01055) | 48.43th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.05% (0.01055) | 27.52th | v2 (v2022.01.01) |
References (5)
- https://access.redhat.com/security/cve/CVE-2011-4973 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1017197 x_refsource_CONFIRMIssue TrackingThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2011-4973
- https://www.cve.org/CVERecord?id=CVE-2011-4973
- https://www.redhat.com/archives/mod_nss-list/2011-May/msg00001.html mailing-listx_refsource_MLISTIssue TrackingThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2011-4973 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1017197 | x_refsource_CONFIRMIssue TrackingThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2011-4973 | ||
| https://www.cve.org/CVERecord?id=CVE-2011-4973 | ||
| https://www.redhat.com/archives/mod_nss-list/2011-May/msg00001.html | mailing-listx_refsource_MLISTIssue TrackingThird Party Advisory |
Change history (0)
No recorded changes yet.