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Public proof of concept

CVE-2023-5491

A public proof of concept exists; no exploitation attested.

  • Published2023-10-10
  • WeaknessCWE-434

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2023-10-1015:15CVE publishedNVD

Versions per branch

NVD
Byzoro smart s45f firmwareversion to verify
BranchAffectedFixed in
20230928.x≤ 20230928no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionpoc2025-06-16
  • CNACVSS 3.16.3known since 2026-10-23
  • NVDCVSS 3.18.8read 2026-10-23
  • CNACVSS 2.06.5known since 2026-10-23
  • CNAweakness (CWE)CWE-434known since 2026-10-23
  • FIRST EPSSEPSS score2.0 %2026-11-08
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2023-10-10
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-mg88-vr9f-rg8p

Frequently asked questions

What is CVE-2023-5491?

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.

Is CVE-2023-5491 actively exploited?

A proof-of-concept exploit exists for CVE-2023-5491, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2023-5491?

CVE-2023-5491 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record