How severe is CVE-2011-4973?

CVE-2011-4973 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2011-4973 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4973?

CVE-2011-4973 affects Mod Nss Project Mod Nss. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2011-4973?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2011-4973 published?

CVE-2011-4973 was published on 2018-02-15 and last updated on 2026-06-16.

CVE-2011-4973

CVE-2011-4973 is a critical-severity vulnerability in Mod Nss Project Mod Nss with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Mod Nss Project Mod Nss
Published: 2018-02-15
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2011-4973?: 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.
How severe is CVE-2011-4973?: CVE-2011-4973 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2011-4973 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4973?: CVE-2011-4973 affects Mod Nss Project Mod Nss. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2011-4973?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2011-4973 published?: CVE-2011-4973 was published on 2018-02-15 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:mod_nss_project:mod_nss:1.0.8:*:*:*:*:*:*:*

More vulnerabilities in Mod Nss Project Mod Nss

CVE-2015-5244 — Critical (CVSS 9.8): The NSSCipherSuite option with ciphersuites enabled in mod_nss before 1.0.12 allows remote attackers to bypass…
CVE-2015-3277 — High (CVSS 7.5): The mod_nss module before 1.0.11 in Fedora allows remote attackers to obtain cipher lists due to incorrect parsing of…
CVE-2013-4566 — Medium (CVSS 4.0): mod_nss 1.0.8 and earlier, when NSSVerifyClient is set to none for the server/vhost context, does not enforce the…

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Other CWE-287 (Improper Authentication) vulnerabilities

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CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

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