CVE-2021-39217Network attack vector

Authenticated command execution via qualified block methods

Published Jan 27, 2023 · Updated Mar 10, 2025

Command injection in OpenMage LTS 19.4.21 and earlier and 20.0.0 through 20.0.18 allows remote authenticated users to execute commands. The validateAgainstBlockMethodBlacklist method mishandles class-qualified method names, so a subclass qualifier bypasses checks on forbidden block methods. An administrator permitted to update Custom Layout content can invoke blocked rendering methods and execute commands with the web application's privileges.

CVSS severity7.2
High
EPSS probability1.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in OpenMage LTS 19.4.21 and earlier and 20.0.0 through 20.0.18 allows remote authenticated users to execute commands. The validateAgainstBlockMethodBlacklist method mishandles class-qualified method names, so a subclass qualifier bypasses checks on forbidden block methods. An administrator permitted to update Custom Layout content can invoke blocked rendering methods and execute commands with the web application's privileges.

The record

CVE
CVE-2021-39217
Published
Jan 27, 2023
Updated
Mar 10, 2025
Vendor
OpenMage
Product
OpenMage LTS
Classifications
CWE-77, T1059
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jan 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 19.4.22
  2. Affected versionversion=>= 20.0.0, < 20.0.19

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

OpenMage · OpenMage LTSversion=< 19.4.22; version=>= 20.0.0, < 20.0.19

Published CVSS scores

7.2GitHub, Inc.CVSS: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

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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