How severe is CVE-2007-4391?

CVE-2007-4391 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2007-4391 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-4391?

CVE-2007-4391 affects Yahoo Messenger. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2007-4391?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2007-4391 published?

CVE-2007-4391 was published on 2007-08-17 and last updated on 2026-06-16.

CVE-2007-4391

CVE-2007-4391 is a critical-severity vulnerability in Yahoo Messenger with a CVSS 2.0 base score of 9.3. 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-20.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 9% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Yahoo Messenger
Published: 2007-08-17
Last modified: 2026-06-16

Description

Heap-based buffer overflow in Kakadu kdu_v32m.dll in Yahoo! Messenger 8.1.0.413 allows remote attackers to cause a denial of service (application crash) via a certain length field in JPEG2000 data, as demonstrated by sending an "invite to view my webcam" request, and then injecting a DLL into the attacker's peer Yahoo! Messenger application when this request is accepted.

Frequently asked questions

What is CVE-2007-4391?: Heap-based buffer overflow in Kakadu kdu_v32m.dll in Yahoo! Messenger 8.1.0.413 allows remote attackers to cause a denial of service (application crash) via a certain length field in JPEG2000 data, as demonstrated by sending an "invite to view my webcam" request, and then injecting a DLL into the attacker's peer Yahoo! Messenger application when this request is accepted.
How severe is CVE-2007-4391?: CVE-2007-4391 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2007-4391 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-4391?: CVE-2007-4391 affects Yahoo Messenger. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2007-4391?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2007-4391 published?: CVE-2007-4391 was published on 2007-08-17 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:yahoo:messenger:8.1.0.413:*:*:*:*:*:*:*

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