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Vulnerability record · CVE-2019-5021 · published 8 May 2019

CVE-2019-5021: Gliderlabs docker-alpine vulnerability

GGliderlabs · Docker Alpine

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.

9.8 CVSS 3.1 Critical EPSS 6.3% · top 6.7% CWE-258 · CWE-258
9.8CVSS 3.1 base score, v2 10.0
6.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
12References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00004.html Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/108288 Broken Link
https://alpinelinux.org/posts/Docker-image-vulnerability-CVE-2019-5021.html Vendor Advisory
https://security.netapp.com/advisory/ntap-20190510-0001/ Third Party Advisory
https://support.f5.com/csp/article/K25551452 Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0782 ExploitMitigationPatchThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00004.html Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/108288 Broken Link
https://alpinelinux.org/posts/Docker-image-vulnerability-CVE-2019-5021.html Vendor Advisory
https://security.netapp.com/advisory/ntap-20190510-0001/ Third Party Advisory
https://support.f5.com/csp/article/K25551452 Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0782 ExploitMitigationPatchThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-5021), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.