CVE-2011-4973

Authentication bypass vulnerability in mod_nss 1.0.8 allows remote attackers to assume the...

9.8 CriticalFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

1.00%Down 0.1 points since Feb 4, 2022

What each source reports

NVD Score used 9.8

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.

Record: CVE-2011-4973
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-287
Updated: 2026-11-02

CVE List No score

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.

Record: CVE-2011-4973
Updated: 2026-11-02

EUVDEUVD-2011-4878 No score

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.

Record: EUVD-2011-4878
Updated: 2026-11-03

GitHub AdvisoriesGHSA-mmjq-r7xw-fqr8 9.8

Authentication bypass vulnerability in mod_nss 1.0.8 allows remote attackers to assume the...

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.

Record: GHSA-mmjq-r7xw-fqr8
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-287
Updated: 2026-11-02

OSVUBUNTU-CVE-2011-4973 9.8

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.

Record: UBUNTU-CVE-2011-4973
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

mod nss project nss

Affected packages

Affected packages
Package	Affected	Fixed
`mod_nss` Red Hat:enterprise_linux:6::client	before 0:1.0.8-13.el6	0:1.0.8-13.el6
`mod_nss-debuginfo` Red Hat:enterprise_linux:6::client	before 0:1.0.8-13.el6	0:1.0.8-13.el6
`mod_nss` Red Hat:enterprise_linux:6::computenode	before 0:1.0.8-13.el6	0:1.0.8-13.el6
`mod_nss-debuginfo` Red Hat:enterprise_linux:6::computenode	before 0:1.0.8-13.el6	0:1.0.8-13.el6
`mod_nss` Red Hat:enterprise_linux:6::server	before 0:1.0.8-13.el6	0:1.0.8-13.el6
`mod_nss-debuginfo` Red Hat:enterprise_linux:6::server	before 0:1.0.8-13.el6	0:1.0.8-13.el6
`mod_nss` Red Hat:enterprise_linux:6::workstation	before 0:1.0.8-13.el6	0:1.0.8-13.el6
`mod_nss-debuginfo` Red Hat:enterprise_linux:6::workstation	before 0:1.0.8-13.el6	0:1.0.8-13.el6
`mod_nss` Red Hat:enterprise_linux:5::client	before 0:1.0.8-7.el5	0:1.0.8-7.el5
`mod_nss-debuginfo` Red Hat:enterprise_linux:5::client	before 0:1.0.8-7.el5	0:1.0.8-7.el5

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Affected packages
Package	Affected	Fixed
`mod_nss` Red Hat:enterprise_linux:5::server	before 0:1.0.8-7.el5	0:1.0.8-7.el5
`mod_nss-debuginfo` Red Hat:enterprise_linux:5::server	before 0:1.0.8-7.el5	0:1.0.8-7.el5
`libapache2-mod-nss` Ubuntu:16.04:LTS	All versions, plus listed versions 1.0.11-11.0.12-11.0.12-2	None known
`libapache2-mod-nss` Ubuntu:18.04:LTS	All versions, plus listed versions 1.0.14-1build1	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2011-4973 is a critical vulnerability (CVSS 9.8) in Mod Nss Project Nss, published February 15, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.00%, the 62nd percentile. Fixed in mod_nss 0:1.0.8-13.el6.

References

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