CVE-2025-43979Public exploitNetwork attack vector

Root command execution via crafted Wi-Fi limit

Published Aug 5, 2025 · Updated Aug 5, 2025

OS command injection in FIRSTNUM JC21A-04 firmware through 2.01ME/FN allows remote authenticated users to execute commands as root. The xml_action.cgi method endpoint passes crafted Wi-Fi client-limit input from the max_num parameter into an OS command without neutralizing command syntax. Access to the authenticated management interface is required; successful exploitation grants root-level command execution and can disclose data or interrupt the device.

CVSS severity7.4
High
EPSS probability6.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in FIRSTNUM JC21A-04 firmware through 2.01ME/FN allows remote authenticated users to execute commands as root. The xml_action.cgi method endpoint passes crafted Wi-Fi client-limit input from the max_num parameter into an OS command without neutralizing command syntax. Access to the authenticated management interface is required; successful exploitation grants root-level command execution and can disclose data or interrupt the device.

The record

CVE
CVE-2025-43979
Published
Aug 5, 2025
Updated
Aug 5, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 5, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.4CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

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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