CVE-2011-4973: mod_nss_project mod_nss Improper Authentication
Vulnerability summary
CVE-2011-4973 is a critical (CVSS 9.8) Improper Authentication vulnerability in mod_nss_project mod_nss. EPSS estimates a 1.00% chance of exploitation in the next 30 days, higher than 62.8% of scored vulnerabilities.
Severe, CVSS 9.8 (NVD); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Timeline
- 15-02-2018PublishedVulnerability first disclosed.
- 07-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
3 scores · 2 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
1.00%
Chance of exploitation in the next 30 days
Percentile
63%
Versus all other CVEs
30-day change
No change 0.00 pp
From 1.00% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat2 products
- mod_nss< 0:1.0.8-13.el6 | < 0:1.0.8-7.el5
- mod_nss-debuginfo< 0:1.0.8-13.el6 | < 0:1.0.8-7.el5
Mod_nss_project1 product
- mod_nss1.0.8
Ubuntu1 product
- libapache2-mod-nssAll versions (No fix recorded)
3 vendors · 4 products
References
14 links- bugzilla.redhat.com/show_bug.cgi?id=1017197X Refsource CONFIRMIssue TrackingThird Party AdvisoryREPORT
- www.redhat.com/archives/mod_nss-list/2011-May/msg00001.htmlMailing ListX Refsource MLISTIssue TrackingThird Party AdvisoryREPORT
