CVE-2023-4739

Name: CVE-2023-4739
Creator: NVD / NIST
Published: 2023-09-03T20:15:13.89+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.07%

Last modified Jun 17, 2026

CVE-2023-4739 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A vulnerability, which was classified as critical, has been found in Byzoro Smart S85F Management Platform up to 20230820. Affected by this issue is some unknown functionality of the file /sysmanage/updateos.php. EPSS estimates a 3.07% chance of exploitation in the next 30 days.

Description

A vulnerability, which was classified as critical, has been found in Byzoro Smart S85F Management Platform up to 20230820. Affected by this issue is some unknown functionality of the file /sysmanage/updateos.php. The manipulation of the argument 1_file_upload leads to unrestricted upload. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-238628. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.07%

86.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
Byzoro	Smart S85f Firmware	<= 20230820

References

https://github.com/Meizhi-hua/cve/blob/main/upload_file.mdExploit
https://vuldb.com/?ctiid.238628Permissions Required, Third Party Advisory, VDB Entry
https://vuldb.com/?id.238628Permissions Required, Third Party Advisory, VDB Entry
https://vuldb.com/?submit.197572
https://github.com/Meizhi-hua/cve/blob/main/upload_file.mdExploit
https://vuldb.com/?ctiid.238628Permissions Required, Third Party Advisory, VDB Entry
https://vuldb.com/?id.238628Permissions Required, Third Party Advisory, VDB Entry
https://vuldb.com/?submit.197572

Timeline

Published: Sep 3, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-4739?

How severe is CVE-2023-4739?

CVE-2023-4739 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.07% probability of exploitation in the next 30 days.

How do I fix CVE-2023-4739?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-4739?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST