CVE-2025-4140: A vulnerability, which was classified as critical, has been found in Netgear EX6120 1.0.3.94

This month

HIGH 8.8MITIGATE

CVE-2025-4140 is a high-severity flaw (CVSS 8.8) affecting ex6120 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.2% (top 32%)
CISA exploited list	No
Weakness	CWE-119, CWE-120
Published	2025-04-30
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: netgear

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-04-30 22:15 UTCPublished CVE record published
2026-06-17 09:32 UTCUpdated Record last modified

netgear ex6120 firmware MITIGATE

Affected: 1.0.3.94

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.3.94

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-4140?

ex6120 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-4140 being exploited?

CVE-2025-4140 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-4140 affect?

CVE-2025-4140 affects ex6120 firmware. Severity is high (CVSS 8.8). 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 remot

How urgent is CVE-2025-4140?

Priority 53/100. High severity; Public exploit reference

Software pages

Netgear vulnerabilities

Related CVEs

CVE-2025-4139 HIGH 8.8 MITIGATE A vulnerability classified as critical was found in Netgear EX6120 1.0.0.68
CVE-2024-35519 HIGH 8.4 UPGRADE UPGRADE Netgear EX6120 v1.0.0.68, Netgear EX6100 v1.0.2.28, and Netgear EX3700 v1.0.0.96 are vulnerable to command inj
CVE-2024-35518 HIGH 8.4 UPGRADE Netgear EX6120 v1.0.0.68 is vulnerable to Command Injection in genie_fix2.cgi via the wan_dns1_pri parameter.
CVE-2021-34982 HIGH 8.8 UPGRADE UPGRADE NETGEAR Multiple Routers httpd Stack-based Buffer Overflow Remote Code Execution Vulnerability

References

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