CVE-2009-3347: Buffer overflow on the D-Link DIR-400 wireless router allows remote attackers to execute arbitrary code via un

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HIGH 10.0MITIGATE

CVE-2009-3347 is a high-severity flaw (CVSS 10.0) affecting dir-400. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow on the D-Link DIR-400 wireless router allows remote attackers to execute arbitrary code via unspecified vectors, as demonstrated by a certain module in VulnDisco Pack Professional 8.10 through 8.11. NOTE: as of 20090917, this disclosure has no actionable information. However, because the VulnDisco Pack author is a reliable researcher, the issue is being assigned a CVE identifier for tracking purposes.

Why this priority

Critical severity
EPSS top 9%: very likely to be exploited

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	4.2% (top 9%)
CISA exploited list	No
Weakness	CWE-119
Published	2009-09-24
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: d-link

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2009-09-24 16:30 UTCPublished CVE record published
2026-06-16 23:11 UTCUpdated Record last modified

d-link dir-400 MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Firmware

Install the latest firmware from the vendor advisory; if none, apply the vendor workaround.

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-2009-3347?

dir-400: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2009-3347 being exploited?

CVE-2009-3347 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-2009-3347 affect?

CVE-2009-3347 affects dir-400. Severity is high (CVSS 10.0). Buffer overflow on the D-Link DIR-400 wireless router allows remote attackers to execute arbitrary code via unspecified vectors, as demonstrated by a certain module in VulnDisco Pack Professional 8.10 through 8.11. NOTE: as of 20090917, th

How urgent is CVE-2009-3347?

Priority 58/100. Critical severity; EPSS top 9%: very likely to be exploited

Software pages

D-Link vulnerabilities

References

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