How severe is CVE-2025-4140?

CVE-2025-4140 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-2025-4140 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-4140?

CVE-2025-4140 affects Netgear Ex6120 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-4140?

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-2025-4140 have an EU (EUVD) identifier?

Yes. CVE-2025-4140 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12793.

When was CVE-2025-4140 published?

CVE-2025-4140 was published on 2025-04-30 and last updated on 2026-06-17.

CVE-2025-4140

CVE-2025-4140 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-120.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
CVSS v4: 8.7
EPSS exploit prediction: 1% (58th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-12793
Weakness: CWE-120
Affected product: Netgear Ex6120 Firmware
Published: 2025-04-30
Last modified: 2026-06-17

Description

A vulnerability, which was classified as critical, has been found in Netgear EX6120 1.0.3.94. Affected by this issue is the function sub_30394. The manipulation of the argument host leads to buffer overflow. The attack may be launched remotely. The vendor was contacted early about this disclosure but did not respond in any way.

Frequently asked questions

What is CVE-2025-4140?: A vulnerability, which was classified as critical, has been found in Netgear EX6120 1.0.3.94. Affected by this issue is the function sub_30394. The manipulation of the argument host leads to buffer overflow. The attack may be launched remotely. The vendor was contacted early about this disclosure but did not respond in any way.
How severe is CVE-2025-4140?: CVE-2025-4140 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-2025-4140 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-4140?: CVE-2025-4140 affects Netgear Ex6120 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-4140?: 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-2025-4140 have an EU (EUVD) identifier?: Yes. CVE-2025-4140 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12793.
When was CVE-2025-4140 published?: CVE-2025-4140 was published on 2025-04-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:netgear:ex6120_firmware:1.0.3.94:*:*:*:*:*:*:*

More vulnerabilities in Netgear Ex6120 Firmware

CVE-2021-32122 — Critical (CVSS 9.8): Certain NETGEAR devices are affected by CSRF. This affects EX3700 before 1.0.0.90, EX3800 before 1.0.0.90, EX6120…
CVE-2018-21134 — Critical (CVSS 9.8): Certain NETGEAR devices are affected by a stack-based buffer overflow by an unauthenticated attacker. This affects…
CVE-2021-45621 — Critical (CVSS 9.6): Certain NETGEAR devices are affected by command injection by an unauthenticated attacker. This affects CBR40 before…
CVE-2020-35800 — Critical (CVSS 9.4): Certain NETGEAR devices are affected by incorrect configuration of security settings. This affects AC2100 before…
CVE-2025-4139 — High (CVSS 8.8): A vulnerability classified as critical was found in Netgear EX6120 1.0.0.68. Affected by this vulnerability is the…
CVE-2021-34982 — High (CVSS 8.8): NETGEAR Multiple Routers httpd Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability…

All CVEs affecting Netgear Ex6120 Firmware →

Other CWE-120 (Classic Buffer Overflow) vulnerabilities

CVE-2025-48611 — Critical (CVSS 10.0): In DeviceId of DeviceId.java, there is a possible desync in persistence due to a missing bounds check. This could lead…
CVE-2026-24823 — Critical (CVSS 10.0): Out-of-bounds Write, Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in FASTSHIFT…
CVE-2026-24810 — Critical (CVSS 10.0): Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in rethinkdb (src/cjson modules).…
CVE-2026-24800 — Critical (CVSS 10.0): Out-of-bounds Write, Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in tildearrow…
CVE-2025-9962 — Critical (CVSS 10.0): A buffer overflow vulnerability in Novakon P series allows attackers to gain root permission without prior…
CVE-2010-10016 — Critical (CVSS 10.0): BS.Player version 2.57 (build 1051) contains a vulnerability in its playlist import functionality. When processing .m3u…

Browse all CWE-120 (Classic Buffer Overflow) vulnerabilities →