How severe is CVE-2009-4309?

CVE-2009-4309 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2009-4309 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 24% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-4309?

CVE-2009-4309 primarily affects Microsoft Windows Media Player. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-4309?

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-2009-4309 published?

CVE-2009-4309 was published on 2009-12-13 and last updated on 2026-06-16.

CVE-2009-4309

CVE-2009-4309 is a critical-severity vulnerability in Microsoft Windows Media Player with a CVSS 2.0 base score of 9.3. Its EPSS exploit-prediction score of 24% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 24% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Microsoft Windows Media Player
Published: 2009-12-13
Last modified: 2026-06-16

Description

Heap-based buffer overflow in the Intel Indeo41 codec for Windows Media Player in Microsoft Windows 2000 SP4, XP SP2 and SP3, and Server 2003 SP2 allows remote attackers to execute arbitrary code via a large size value in a movi record in an IV41 stream in a media file, as demonstrated by an AVI file.

Frequently asked questions

What is CVE-2009-4309?: Heap-based buffer overflow in the Intel Indeo41 codec for Windows Media Player in Microsoft Windows 2000 SP4, XP SP2 and SP3, and Server 2003 SP2 allows remote attackers to execute arbitrary code via a large size value in a movi record in an IV41 stream in a media file, as demonstrated by an AVI file.
How severe is CVE-2009-4309?: CVE-2009-4309 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2009-4309 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 24% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-4309?: CVE-2009-4309 primarily affects Microsoft Windows Media Player. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-4309?: 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-2009-4309 published?: CVE-2009-4309 was published on 2009-12-13 and last updated on 2026-06-16.

References

Affected products (8)

cpe:2.3:a:microsoft:windows_media_player:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_2000:*:sp4:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_2003_server:*:sp2:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_2003_server:*:sp2:itanium:*:*:*:*:*
cpe:2.3:o:microsoft:windows_2003_server:*:sp2:x64:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:*:sp3:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:-:sp2:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:-:sp2:x64:*:*:*:*:*

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