CVE-2023-5491 Byzoro Smart S45F Multi-Service Secure Gateway Intelligent Management Platform updatelib.php unrestricted upload

Medium 6.3 Published 10 Oct 2023 Updated 16 Jun 2025

Attackers can upload malicious files via the updatelib.php endpoint to execute arbitrary code on the Byzoro Smart S45F gateway.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2023-5491?

CVE-2023-5491 is a medium-severity vulnerability in Byzoro Smart S45F Multi-Service Secure Gateway Intelligent Management Platform, published on 10 Oct 2023. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability, which was classified as critical, has been found in Byzoro Smart S45F Multi-Service Secure Gateway Intelligent Management Platform up to 20230928. This issue affects some unknown processing of the file /sysmanage/updatelib.php. The manipulation of the argument file_upload leads to unrestricted upload. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The associated identifier of this vulnerability is VDB-241643. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-434

Which versions are affected by CVE-2023-5491?

It affects 1 product.

Products include Byzoro Smart S45f Firmware.

How do I fix CVE-2023-5491?

No fix has been published for CVE-2023-5491 yet. Limit exposure of the affected software until one is available.

Is CVE-2023-5491 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-5491 exists.

Sources

Also known as GHSA-mg88-vr9f-rg8p.