Critical severity9.8NVD Advisory· Published Nov 26, 2019· Updated Jun 16, 2026

CVE-2011-4120

Description

Yubico PAM Module before 2.10 performed user authentication when 'use_first_pass' PAM configuration option was not used and the module was configured as 'sufficient' in the PAM configuration. A remote attacker could use this flaw to circumvent common authentication process and obtain access to the account in question by providing a NULL value (pressing Ctrl-D keyboard sequence) as the password string.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Yubico/Pam Module2 versions
cpe:2.3:a:yubico:pam_module:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:yubico:pam_module:*:*:*:*:*:*:*:*range: <2.10
- (no CPE)range: <2.10
Debian/linux3 versions
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
yubico-pam/yubico-pamv5
Range: before 2.10

Patches

Vulnerability mechanics

References

bugzilla.redhat.com/show_bug.cginvdIssue TrackingPatchThird Party Advisory
access.redhat.com/security/cve/cve-2011-4120nvdBroken LinkThird Party Advisory
security-tracker.debian.org/tracker/CVE-2011-4120nvdThird Party Advisory
www.openwall.com/lists/oss-security/2011/11/07/6nvdMailing ListThird Party Advisory

News mentions

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cvss	0.637
epss	0.002
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000