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CVE-2019-5021

CRITICAL

Versions of the Official Alpine Linux Docker images (since v3.3) contain a NULL password for the `root` user. This vulnerability appears to be the result of a regression introduced in December of 2015. Due to the nature of this issue, systems deployed using affected versions of the Alpine Linux container which utilize Linux PAM, or some other mechanism which uses the system shadow file as an authentication database, may accept a NULL password for the `root` user.

Published: May 8, 2019 Modified: Jun 17, 2026
CWE-258

CVSS Metrics

CVSSv3
Attack Vector: NETWORK Attack Complexity: LOW Privileges Required: NONE User Interaction: NONE Scope: UNCHANGED Confidentiality Impact: HIGH Integrity Impact: HIGH Availability Impact: HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Products (4)

Vendor Product Version
gliderlabs docker-alpine * ≥ 3.3
opensuse leap 15.0
opensuse leap 15.1
f5 big-ip_controller 1.2.1

GitHub Security Advisory GHSA-m3hq-qcc9-75f6

Versions of the Official Alpine Linux Docker images (since v3.3) contain a NULL password for the ...

Risk Scores

CVSS Score 9.8 / 10
EPSS Score 6.26%

Top 7% most likely to be exploited

Threat Score 41.1 / 100

Data Sources

NVD EPSS GitHub