CVE-2021-42194Network attack vector

Authenticated external entity resolution via unchecked XML

Published Mar 20, 2022 · Updated Aug 4, 2024

XML external entity injection in EyouCMS 1.5.4-UTF8-SP3 allows remote authenticated users to trigger server-side entity resolution. The wechat_return function in /controller/Index.php passes user-controlled XML directly to simplexml_load_string without disabling external entities. The network endpoint requires high-privilege authentication; published sources do not identify the exact data or service consequence.

CVSS severity7.2
High
EPSS probability1.07%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XML external entity injection in EyouCMS 1.5.4-UTF8-SP3 allows remote authenticated users to trigger server-side entity resolution. The wechat_return function in /controller/Index.php passes user-controlled XML directly to simplexml_load_string without disabling external entities. The network endpoint requires high-privilege authentication; published sources do not identify the exact data or service consequence.

The record

CVE
CVE-2021-42194
Published
Mar 20, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-611
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 20, 2022CVE 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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P

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-611Improper Restriction of XML External Entity Reference

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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