How severe is CVE-2025-43979?

CVE-2025-43979 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2025-43979 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-43979?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-43979 have an EU (EUVD) identifier?

Yes. CVE-2025-43979 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-23634.

When was CVE-2025-43979 published?

CVE-2025-43979 was published on 2025-08-05 and last updated on 2026-06-17.

CVE-2025-43979

CVE-2025-43979 is a high-severity vulnerability with a CVSS 3.x base score of 7.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 7.4)
EPSS exploit prediction: 5% (92nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-23634
Weakness: CWE-78
Published: 2025-08-05
Last modified: 2026-06-17

Description

An issue was discovered on FIRSTNUM JC21A-04 devices through 2.01ME/FN that allows authenticated attackers to execute arbitrary OS system commands with root privileges via crafted payloads to the xml_action.cgi?method= endpoint.

Frequently asked questions

What is CVE-2025-43979?: An issue was discovered on FIRSTNUM JC21A-04 devices through 2.01ME/FN that allows authenticated attackers to execute arbitrary OS system commands with root privileges via crafted payloads to the xml_action.cgi?method= endpoint.
How severe is CVE-2025-43979?: CVE-2025-43979 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2025-43979 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-43979?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-43979 have an EU (EUVD) identifier?: Yes. CVE-2025-43979 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-23634.
When was CVE-2025-43979 published?: CVE-2025-43979 was published on 2025-08-05 and last updated on 2026-06-17.

References

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