CVE-2020-21322Public exploitNetwork attack vector

Remote code execution via PHP avatar upload

Published Sep 15, 2021 · Updated Aug 4, 2024

Unrestricted file upload in Feehi CMS 2.0.8 and earlier allows remote attackers to execute arbitrary code through a crafted PHP file. The backend self-update avatar path accepts a PHP-suffixed upload as an image and stores it where the web server can execute it. Published scoring treats the request as unauthenticated and requiring no user interaction; successful exploitation runs PHP with the web application's privileges.

CVSS severity9.8
Critical
EPSS probability1.78%
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 Feehi CMS 2.0.8 and earlier allows remote attackers to execute arbitrary code through a crafted PHP file. The backend self-update avatar path accepts a PHP-suffixed upload as an image and stores it where the web server can execute it. Published scoring treats the request as unauthenticated and requiring no user interaction; successful exploitation runs PHP with the web application's privileges.

The record

CVE
CVE-2020-21322
Published
Sep 15, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, T1505.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NVDCVSS: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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1505.003Web 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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