CVE-2020-21651Public exploitNetwork attack vector

Authenticated code execution via point configuration injection

Published Oct 6, 2021 · Updated Aug 4, 2024

Code injection in Myucms 2.2.1 allows remote authenticated users to execute arbitrary PHP code through the point add method. The add() handler in application/admin/controller/point.php writes the JIFENNAME request value into application/extra/point.php without neutralizing PHP syntax, so requesting that generated file executes the injected expression. An authenticated administrator must submit the crafted setting and request the generated PHP file; successful exploitation runs code with the web application's privileges.

CVSS severity9.8
Critical
EPSS probability3.34%
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 Myucms 2.2.1 allows remote authenticated users to execute arbitrary PHP code through the point add method. The add() handler in application/admin/controller/point.php writes the JIFENNAME request value into application/extra/point.php without neutralizing PHP syntax, so requesting that generated file executes the injected expression. An authenticated administrator must submit the crafted setting and request the generated PHP file; successful exploitation runs code with the web application's privileges.

The record

CVE
CVE-2020-21651
Published
Oct 6, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-94, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 6, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059Command and Scripting Interpreter

Public exploit references

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Technologies

Your stack

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Your stack

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