CVE-2023-5347: An Improper Verification of Cryptographic Signature vulnerability in the update process of Korenix JetNet Seri
62
This week
CRITICAL 9.8REMOTEMITIGATEMITIGATEMITIGATE
CVE-2023-5347 is a critical-severity flaw (CVSS 9.8) affecting jetnet 5310g firmware, jetnet 4508 firmware, jetnet 4508i-w firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
Critical severity
Public exploit reference
Remotely exploitable, no login, no user action
No fix is published yet: follow the downgrade or mitigation steps.
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
Published CVE record published
Updated Record last modified
korenix jetnet 5310g firmware MITIGATE
Affected: 2.6
Fixed in: no fixed release known
Safe to downgrade to: a release before 2.6
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
korenix jetnet 4508 firmware MITIGATE
Affected: 2.3
Fixed in: no fixed release known
Safe to downgrade to: a release before 2.3
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
korenix jetnet 4508i-w firmware MITIGATE
Affected: 1.3
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.3
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
korenix jetnet 4508-w firmware MITIGATE
Affected: 2.3
Fixed in: no fixed release known
Safe to downgrade to: a release before 2.3
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
korenix jetnet 4508if-s firmware MITIGATE
Affected: 1.3
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.3
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
korenix jetnet 4508if-m firmware MITIGATE
Affected: 1.3
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.3
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official sourceNVD · CVE Program · Report a problem with this page Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2023-5347?
jetnet 5310g firmware: mitigate or apply the listed mitigation; jetnet 4508 firmware: mitigate or apply the listed mitigation; jetnet 4508i-w firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2023-5347 being exploited?
CVE-2023-5347 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2023-5347 affect?
CVE-2023-5347 affects jetnet 5310g firmware, jetnet 4508 firmware, jetnet 4508i-w firmware. Severity is critical (CVSS 9.8). 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 firmwar
How urgent is CVE-2023-5347?
Priority 62/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action
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