How severe is CVE-2025-4139?

CVE-2025-4139 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-4139 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-4139?

CVE-2025-4139 affects Netgear Ex6120 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-4139?

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-2025-4139 have an EU (EUVD) identifier?

Yes. CVE-2025-4139 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12772.

When was CVE-2025-4139 published?

CVE-2025-4139 was published on 2025-04-30 and last updated on 2026-06-17.

CVE-2025-4139

CVE-2025-4139 is a high-severity vulnerability in Netgear Ex6120 Firmware with a CVSS 3.x base score of 8.8. 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-119.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
CVSS v4: 8.7
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-12772
Weakness: CWE-119
Affected product: Netgear Ex6120 Firmware
Published: 2025-04-30
Last modified: 2026-06-17

Description

A vulnerability classified as critical was found in Netgear EX6120 1.0.0.68. Affected by this vulnerability is the function fwAcosCgiInbound. The manipulation of the argument host leads to buffer overflow. The attack can be launched remotely. The vendor was contacted early about this disclosure but did not respond in any way.

Frequently asked questions

What is CVE-2025-4139?: A vulnerability classified as critical was found in Netgear EX6120 1.0.0.68. Affected by this vulnerability is the function fwAcosCgiInbound. The manipulation of the argument host leads to buffer overflow. The attack can be launched remotely. The vendor was contacted early about this disclosure but did not respond in any way.
How severe is CVE-2025-4139?: CVE-2025-4139 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-4139 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-4139?: CVE-2025-4139 affects Netgear Ex6120 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-4139?: 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-2025-4139 have an EU (EUVD) identifier?: Yes. CVE-2025-4139 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12772.
When was CVE-2025-4139 published?: CVE-2025-4139 was published on 2025-04-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:netgear:ex6120_firmware:1.0.0.68:*:*:*:*:*:*:*

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