CVE-2021-27513Public exploitNetwork attack vector

Authenticated code execution via unrestricted file upload

Published Feb 21, 2021 · Updated Aug 3, 2024

Unrestricted file upload in EyesOfNetwork 5.3-10 allows remote authenticated users to execute code by uploading arbitrary .xml.php files. The admin_ITSM module trusts a client-side userside filter, so an intercepted multipart request can submit a PHP payload with an XML.php filename and retrieve it from the upload path. The attack requires a valid remote session; successful retrieval executes the uploaded PHP with the web service account and can compromise confidentiality, integrity, and availability.

CVSS severity8.8
High
EPSS probability28.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in EyesOfNetwork 5.3-10 allows remote authenticated users to execute code by uploading arbitrary .xml.php files. The admin_ITSM module trusts a client-side userside filter, so an intercepted multipart request can submit a PHP payload with an XML.php filename and retrieve it from the upload path. The attack requires a valid remote session; successful retrieval executes the uploaded PHP with the web service account and can compromise confidentiality, integrity, and availability.

The record

CVE
CVE-2021-27513
Published
Feb 21, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 21, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NVDAV: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.

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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-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

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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