CVE-2011-4120

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-04-22. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.0%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation2% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
2.0%
EPSS %ILE
80th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

November 26, 2019

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Sep 30, 2026
Patch available. Sources: redhat.
generic

oss-security - Re: CVE Request -- pam_yubico -- Authentication bypass via NULL password

https://www.openwall.com/lists/oss-security/2011/11/07/6
generic

CVE-2011-4120

https://security-tracker.debian.org/tracker/CVE-2011-4120
redhat Patch Available

733322 – (CVE-2011-4120) CVE-2011-4120 pam_yubico: Authentication bypass via NULL password

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4120
redhat Patch Available

CVE-2011-4120 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/cve-2011-4120

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
yubico-pam—
  • every version up to 2.10-1: fixed in 2.10-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
yubico-pam—
  • every version up to 2.10-1: fixed in 2.10-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
yubico-pam—
  • every version up to 2.10-1: fixed in 2.10-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
yubico-pam—
  • every version up to 2.10-1: fixed in 2.10-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 3× in last 7d / 14× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 127 total refreshes for this CVE.

  1. 2026-10-05 17:37 UTCEPSS rescore
  2. 2026-09-30 14:58 UTCEPSS rescore
  3. 2026-09-29 08:22 UTCEG score recompute
  4. 2026-09-28 13:44 UTCEPSS rescore
  5. 2026-09-27 15:07 UTCOSV refresh
  6. 2026-09-27 13:39 UTCEPSS rescore
  7. 2026-09-26 15:52 UTCEPSS rescore
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  13. 2026-09-07 23:51 UTCOSV refresh
  14. 2026-09-06 13:41 UTCEPSS rescore
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  24. 2026-08-05 22:24 UTCOSV refresh
  25. 2026-08-05 19:12 UTCEPSS rescore
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  1. 2026-08-04 15:04 UTCEPSS rescore
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  3. 2026-07-30 01:26 UTCEPSS rescore
  4. 2026-07-23 14:14 UTCEPSS rescore
  5. 2026-07-23 01:05 UTCEG score recompute
  6. 2026-07-23 00:09 UTCEG score recompute
  7. 2026-07-22 21:48 UTCEG score recompute
  8. 2026-07-22 14:03 UTCEPSS rescore
  9. 2026-07-21 15:21 UTCEPSS rescore
  10. 2026-07-20 17:03 UTCEPSS rescore
  11. 2026-07-20 17:03 UTCEPSS rescore
  12. 2026-07-20 01:16 UTCOSV refresh
  13. 2026-07-19 02:25 UTCEPSS rescore
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  24. 2026-07-08 15:10 UTCEPSS rescore
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  26. 2026-07-06 16:23 UTCEPSS rescore
  27. 2026-07-06 02:19 UTCEPSS rescore
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  29. 2026-07-05 02:26 UTCEPSS rescore
  30. 2026-07-04 06:27 UTCEPSS rescore
  31. 2026-07-02 16:52 UTCOSV refresh
  32. 2026-07-02 14:01 UTCEPSS rescore
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  35. 2026-06-30 23:19 UTCEPSS rescore
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  41. 2026-06-27 03:05 UTCEPSS rescore
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  43. 2026-06-25 13:46 UTCEPSS rescore
  44. 2026-06-24 14:02 UTCEPSS rescore
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  54. 2026-06-18 17:49 UTCEPSS rescore
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  63. 2026-06-14 13:43 UTCOSV refresh
  64. 2026-06-13 22:57 UTCEPSS rescore
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  67. 2026-06-11 13:56 UTCEPSS rescore
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  69. 2026-06-10 13:17 UTCEPSS rescore
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  74. 2026-06-06 13:45 UTCEPSS rescore
  75. 2026-06-06 13:44 UTCEPSS rescore

Related CVEs(same product + same CWE)

Same product

1 shown

Debian:11:yubico-pam

Frequently asked(5)

What is CVE-2011-4120?
CVE-2011-4120 is a critical vulnerability published on November 26, 2019. Yubico PAM Module before 2.10 performed user authentication when 'usefirstpass' 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…
When was CVE-2011-4120 disclosed?
CVE-2011-4120 was first published on November 26, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2011-4120 actively exploited?
CVE-2011-4120 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.0% probability of exploitation in the next 30 days (80th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2011-4120?
CVE-2011-4120 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2011-4120?
A fix for CVE-2011-4120 is available: update to the fixed version the vendor names in its advisory.

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