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Vulnerabilities

Vulnerability · CVE-2011-4120

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 con

Published Nov 26, 2019 · catalog updated Oct 23, 2026 · Yubico PAM Module before

Check if you run it

No confirmed exploitation is on record for CVE-2011-4120. EPSS is 2.02%. Act only if a listed version of Yubico PAM Module before is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Yubico PAM Module before).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
2.02%
Remediation
Advisory link
Affected products
Debian:12 yubico-pam · Debian:13 yubico-pam · Debian:14 yubico-pam

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 yubico-pam0 → 2.10-1
  • Debian:13 yubico-pam0 → 2.10-1
  • Debian:14 yubico-pam0 → 2.10-1

How to fix CVE-2011-4120

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2011-4120. EPSS is 2.02%. Act only if a listed version of Yubico PAM Module before is installed.

Which versions are affected?

Compare what you have installed with 0 → 2.10-1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 2.02%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Nov 26, 2019 · Trivy Vulnerability DB

    Detected

    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 str

  2. Oct 23, 2026 · Trivy Vulnerability DB

    Fix available

    yubico-pam fixed in 2.10-1; yubico-pam fixed in 2.10-1; yubico-pam fixed in 2.10-1

  3. Oct 23, 2026 · Trivy Vulnerability DB

    Fix available

    yubico-pam fixed in 2.10-1

  4. Oct 23, 2026 · Trivy Vulnerability DB

    Updated

    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 str

Sources

  • CVE.orgVulnerability recordCVE-2011-4120

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2011-4120

    30-day exploitation probability 2.02%

    first.org
  • Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2011-4120

    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 ob

    osv.dev

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.