CVE-2020-21483Network attack vector

Authenticated code execution via JPEG-to-PHP upload

Published Sep 15, 2021 · Updated Aug 4, 2024

Unrestricted file upload in Jizhicms 1.5 allows remote authenticated users to execute arbitrary code through a crafted JPEG file. The upload flow accepts a crafted JPEG and permits it to be changed to a server-executable PHP file; the responsible endpoint and function are undisclosed. Administrative privileges are required, and successful exploitation runs attacker-supplied PHP code with the web application's privileges.

CVSS severity7.2
High
EPSS probability1.69%
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 Jizhicms 1.5 allows remote authenticated users to execute arbitrary code through a crafted JPEG file. The upload flow accepts a crafted JPEG and permits it to be changed to a server-executable PHP file; the responsible endpoint and function are undisclosed. Administrative privileges are required, and successful exploitation runs attacker-supplied PHP code with the web application's privileges.

The record

CVE
CVE-2020-21483
Published
Sep 15, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, T1190
Attack vector
network
Privileges
admin

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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
7.2NIST NVDCVSS: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-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

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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