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.

Published: 2018-02-15 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-4973 is rated Moderate Risk (50/100): CVSS Critical severity, with low exploitation likelihood (EPSS 0.11%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2011-4973

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-12-14 0.16% 0.11% -0.05%
2 2025-03-30 0.80% 0.16% -0.64%
3 2025-03-29 — 0.80% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-4973

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2011-4973

OS Trackers for CVE-2011-4973

vendor priority summary link
redhat medium — https://access.redhat.com/security/cve/CVE-2011-4973
ubuntu medium CVE-2011-4973 medium priority: Ubuntu including 1 source packages (libapache2-mod-nss), 30 status rows across 30 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lucid, lunar, mantic, noble, oracular, plucky, precise, quantal, questing, raring, saucy, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): DNE 16, ignored 11, needed 3. https://ubuntu.com/security/CVE-2011-4973

Affected software / configurations for CVE-2011-4973

Vendor Product Version Raw CPE
mod_nss_project mod_nss 1.0.8 cpe:2.3:a:mod_nss_project:mod_nss:1.0.8:*:*:*:*:*:*:*

References for CVE-2011-4973

URL Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1017197 Issue Tracking Third Party Advisory
https://www.redhat.com/archives/mod_nss-list/2011-May/msg00001.html Issue Tracking Third Party Advisory
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