CVE-2024-3521Public exploitNetwork attack vector

Authenticated code execution via unrestricted PHP upload

Published Apr 9, 2024 · Updated Aug 1, 2024

Unrestricted file upload in Byzoro Smart S80 Management Platform 20240317 and earlier allows remote authenticated users to execute PHP code. The hidwel branch in /useratte/userattestation.php accepts the web_img multipart file and saves it under /boot/web/upload/weblogo without restricting its suffix. Administrative session access is required; a successful upload places attacker-supplied PHP in a web-accessible location for server-side execution.

CVSS severity4.7
Medium
EPSS probability1.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Unrestricted file upload in Byzoro Smart S80 Management Platform 20240317 and earlier allows remote authenticated users to execute PHP code. The hidwel branch in /useratte/userattestation.php accepts the web_img multipart file and saves it under /boot/web/upload/weblogo without restricting its suffix. Administrative session access is required; a successful upload places attacker-supplied PHP in a web-accessible location for server-side execution.

The record

CVE
CVE-2024-3521
Published
Apr 9, 2024
Updated
Aug 1, 2024
Vendor
Byzoro
Product
Smart S80 Management Platform
Classifications
CWE-434, T1190
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 9, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <20240317
  2. Affected versionversion=20240317

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Byzoro · Smart S80 Management Platformversion=0 <20240317; version=20240317

Published CVSS scores

4.7VulDBCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
5.8VulDBAV:N/AC:L/Au:M/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 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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo