CVE-2023-5376Public exploitNetwork attack vector

Unauthenticated file access via unrestricted TFTP

Published Jan 9, 2024 · Updated Oct 8, 2025

Missing authentication in Korenix JetNet Series firmware before 2024/01 allows remote attackers to read or write files through TFTP. The TFTP service accepts unauthenticated GET and PUT operations for absolute paths under /home, including an uploaded firmware image. Network access to the appliance is sufficient; successful requests expose or replace files in the restricted directory without device credentials.

CVSS severity9.1
Critical
EPSS probability1.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Korenix JetNet Series firmware before 2024/01 allows remote attackers to read or write files through TFTP. The TFTP service accepts unauthenticated GET and PUT operations for absolute paths under /home, including an uploaded firmware image. Network access to the appliance is sufficient; successful requests expose or replace files in the restricted directory without device credentials.

The record

CVE
CVE-2023-5376
Published
Jan 9, 2024
Updated
Oct 8, 2025
Vendor
Korenix Technology
Product
JetNet Series
Classifications
CWE-306, CAPEC-114, T1105
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 9, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 8, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=firmware older than 2024/01

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Korenix Technology · JetNet Seriesversion=firmware older than 2024/01

Published CVSS scores

9.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
8.6CyberDanubeCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CAPEC-114Authentication Abuse
T1105Ingress Tool Transfer

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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