CVE-2023-5347

Unauthenticated Firmware Upgrade

9.8 Critical

An Improper Verification of Cryptographic Signature vulnerability in the update process of Korenix JetNet Series allows replacing the whole operating system including Trusted Executables. This issue affects JetNet devices older than firmware version 2024/01.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

1.34%Up 1.3 points since Jan 10, 2024

What each source reports

CVE List Score used 9.8

Unauthenticated Firmware Upgrade

Record: CVE-2023-5347
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-347, CWE-327
Updated: 2026-11-02

EUVDEUVD-2023-57664 9.8

Record: EUVD-2023-57664
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-3fr9-8m46-r2mm 9.8

An Improper Verification of Cryptographic Signature vulnerability in the update process of...

Record: GHSA-3fr9-8m46-r2mm
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-327, CWE-347
Updated: 2026-11-02

NVD 9.8

Record: CVE-2023-5347
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Weakness: CWE-327, CWE-347
Updated: 2026-11-02

Affected products

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History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2023-5347 is a critical vulnerability (CVSS 9.8) in Korenix Jetnet Series, published January 9, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.34%, the 71st percentile. No source names a fixed version.