What is CVE-2021-27928?

CVE-2021-27928 is a high-severity vulnerability in Galeracluster Wsrep, classified under Code Injection. CVSS score: 7.2/10. Published 2021-03-19.

How severe is CVE-2021-27928?

High severity. CVSS v3 base score is 7.2 out of 10.

Is CVE-2021-27928 known to be exploited?

56 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

RCE in Galeracluster Wsrep

CVE-2021-27928

A remote code execution issue was discovered in MariaDB 10.2 before 10.2.37, 10.3 before 10.3.28, 10.4 before 10.4.18, and 10.5 before 10.5.9; Percona Server through 2021-03-03; and the wsrep patch through 2021-03-03 for MySQL. An untrusted search path leads to eval injection, in which a database SUPER user can execute OS commands after modifying wsrep_provider and wsrep_notify_cmd. NOTE: this does not affect an Oracle product.

Vulnerability class: RCE (Remote Code Execution)

Published 2021-03-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.384 (98.5th percentile), scored 2026-09-28.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.384 · newest: 0.384 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-94 — Code Injection

Public proof-of-concept exploits

References

mariadb.com/kb/en/security/ (Vendor Advisory)
jira.mariadb.org/browse/MDEV-25179 (Issue Tracking, Vendor Advisory)
mariadb.com/kb/en/mariadb-10237-release-notes/ (Release Notes, Vendor Advisory)
mariadb.com/kb/en/mariadb-10328-release-notes/ (Release Notes, Vendor Advisory)
mariadb.com/kb/en/mariadb-10418-release-notes/ (Release Notes, Vendor Advisory)
mariadb.com/kb/en/mariadb-1059-release-notes/ (Release Notes, Vendor Advisory)
lists.debian.org/debian-lts-announce/2021/03/msg00028.html (mailing-list, Mailing List, Third Party Advisory)
packetstormsecurity.com/files/162177/MariaDB-10.2-Command-Execution.html (Exploit, VDB Entry, Third Party Advisory)
security.gentoo.org/glsa/202105-28 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2021-27928?: CVE-2021-27928 is a high-severity vulnerability in Galeracluster Wsrep, classified under Code Injection. CVSS score: 7.2/10. Published 2021-03-19.
How severe is CVE-2021-27928?: High severity. CVSS v3 base score is 7.2 out of 10.
Is CVE-2021-27928 known to be exploited?: 56 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.