CVE-2024-4240: A vulnerability was found in Tenda W9 1.0.0.7(4456)

This month

HIGH 8.8MITIGATE

CVE-2024-4240 is a high-severity flaw (CVSS 8.8) affecting w9 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was found in Tenda W9 1.0.0.7(4456). It has been classified as critical. This affects the function formQosManageDouble_user. The manipulation of the argument ssidIndex leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The associated identifier of this vulnerability is VDB-262131. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.

Why this priority

High severity

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	1.5% (top 27%)
CISA exploited list	No
Weakness	CWE-121, CWE-787
Published	2024-04-26
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: tenda

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

Am I affected?

Timeline

2024-04-26 21:15 UTCPublished CVE record published
2026-06-17 08:01 UTCUpdated Record last modified

tenda w9 firmware MITIGATE

Affected: 1.0.0.7\(4456\)

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

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-2024-4240?

w9 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-4240 being exploited?

CVE-2024-4240 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-2024-4240 affect?

CVE-2024-4240 affects w9 firmware. Severity is high (CVSS 8.8). A vulnerability was found in Tenda W9 1.0.0.7(4456). It has been classified as critical. This affects the function formQosManageDouble_user. The manipulation of the argument ssidIndex leads to stack-based buffer overflow. It is possible to

How urgent is CVE-2024-4240?

Priority 49/100. High severity

Related CVEs

CVE-2024-52788 HIGH 8.0 MITIGATE Tenda W9 v1.0.0.7(4456) was discovered to contain a hardcoded password vulnerability in /etc_ro/shadow, which
CVE-2024-4244 HIGH 8.8 MITIGATE A vulnerability classified as critical was found in Tenda W9 1.0.0.7(4456)
CVE-2024-4243 HIGH 8.8 MITIGATE A vulnerability classified as critical has been found in Tenda W9 1.0.0.7(4456)
CVE-2024-4242 HIGH 8.8 MITIGATE A vulnerability was found in Tenda W9 1.0.0.7(4456)
CVE-2024-4241 HIGH 8.8 MITIGATE A vulnerability was found in Tenda W9 1.0.0.7(4456)

References

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