How severe is CVE-2009-1545?

CVE-2009-1545 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2009-1545 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 29% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-1545?

CVE-2009-1545 primarily affects Microsoft Windows 2003 Server. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-1545?

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-2009-1545 published?

CVE-2009-1545 was published on 2009-08-12 and last updated on 2026-06-16.

CVE-2009-1545

CVE-2009-1545 is a critical-severity vulnerability in Microsoft Windows 2003 Server with a CVSS 2.0 base score of 9.3. Its EPSS exploit-prediction score of 29% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 29% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Microsoft Windows 2003 Server
Published: 2009-08-12
Last modified: 2026-06-16

Description

Unspecified vulnerability in Avifil32.dll in the Windows Media file handling functionality in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold, SP1, and SP2, and Server 2008 Gold and SP2 allows remote attackers to execute arbitrary code via a malformed header in a crafted AVI file, aka "Malformed AVI Header Vulnerability."

Frequently asked questions

What is CVE-2009-1545?: Unspecified vulnerability in Avifil32.dll in the Windows Media file handling functionality in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold, SP1, and SP2, and Server 2008 Gold and SP2 allows remote attackers to execute arbitrary code via a malformed header in a crafted AVI file, aka "Malformed AVI Header Vulnerability."
How severe is CVE-2009-1545?: CVE-2009-1545 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2009-1545 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 29% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-1545?: CVE-2009-1545 primarily affects Microsoft Windows 2003 Server. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-1545?: 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-2009-1545 published?: CVE-2009-1545 was published on 2009-08-12 and last updated on 2026-06-16.

References

Affected products (15)

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_server_2008:*:*:itanium:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2008:*:sp2:x64:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2008:-:-:x32:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2008:-:-:x64:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2008:-:sp2:itanium:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2008:-:sp2:x86:*:*:*:*:*
cpe:2.3:o:microsoft:windows_vista:*:sp1:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_vista:*:sp2:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_vista:-:-:x64:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:*:sp2:x64:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:-:sp2:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:-:sp3:*:*:*:*:*:*

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