CVE-2021-27928Public exploitNetwork attack vector

Privileged command execution via writable wsrep variables

Published Mar 19, 2021 · Updated Aug 3, 2024

Code injection in affected MariaDB, Percona Server, and wsrep patch releases allows remote authenticated users to execute OS commands. The writable wsrep_provider variable loads a user-selected shared library, while wsrep_notify_cmd sends a user-selected command through an untrusted search path that reaches evaluation. Exploitation requires database SUPER privilege and runs code under the database server process account, enabling host compromise within that account's permissions.

CVSS severity7.2
High
EPSS probability38.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in affected MariaDB, Percona Server, and wsrep patch releases allows remote authenticated users to execute OS commands. The writable wsrep_provider variable loads a user-selected shared library, while wsrep_notify_cmd sends a user-selected command through an untrusted search path that reaches evaluation. Exploitation requires database SUPER privilege and runs code under the database server process account, enabling host compromise within that account's permissions.

The record

CVE
CVE-2021-27928
Published
Mar 19, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-94, T1129, T1059.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 19, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.0NVDAV:N/AC:L/Au:S/C:C/I:C/A:C
7.2NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1129Shared Modules
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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