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Vulnerability record · CVE-2023-4739 · published 3 September 2023

CVE-2023-4739: Byzoro smart s85f firmware unrestricted file upload vulnerability

BByzoro · Smart S85f Firmware

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.

9.8 CVSS 3.1 Critical EPSS 3.6% · top 11.0% CWE-434 · Unrestricted file upload
9.8CVSS 3.1 base score, v2 6.5
3.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/Meizhi-hua/cve/blob/main/upload_file.md Exploit
https://vuldb.com/?ctiid.238628 Permissions RequiredThird Party AdvisoryVDB Entry
https://vuldb.com/?id.238628 Permissions RequiredThird Party AdvisoryVDB Entry
https://vuldb.com/?submit.197572
https://github.com/Meizhi-hua/cve/blob/main/upload_file.md Exploit
https://vuldb.com/?ctiid.238628 Permissions RequiredThird Party AdvisoryVDB Entry
https://vuldb.com/?id.238628 Permissions RequiredThird Party AdvisoryVDB Entry
https://vuldb.com/?submit.197572

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2023-4739), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.