How severe is CVE-2009-0562?

CVE-2009-0562 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2009-0562 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 26% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-0562?

CVE-2009-0562 primarily affects Microsoft Isa Server. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-0562?

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-2009-0562 published?

CVE-2009-0562 was published on 2009-08-12 and last updated on 2026-06-16.

CVE-2009-0562

CVE-2009-0562 is a critical-severity vulnerability in Microsoft Isa Server with a CVSS 2.0 base score of 9.3. Its EPSS exploit-prediction score of 26% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-399.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 26% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Microsoft Isa Server
Published: 2009-08-12
Last modified: 2026-06-16

Description

The Office Web Components ActiveX Control in Microsoft Office XP SP3, Office 2003 SP3, Office XP Web Components SP3, Office 2003 Web Components SP3, Office 2003 Web Components SP1 for the 2007 Microsoft Office System, Internet Security and Acceleration (ISA) Server 2004 SP3 and 2006 SP1, and Office Small Business Accounting 2006 does not properly allocate memory, which allows remote attackers to execute arbitrary code via unspecified vectors that trigger "system state" corruption, aka "Office Web Components Memory Allocation Vulnerability."

Frequently asked questions

What is CVE-2009-0562?: The Office Web Components ActiveX Control in Microsoft Office XP SP3, Office 2003 SP3, Office XP Web Components SP3, Office 2003 Web Components SP3, Office 2003 Web Components SP1 for the 2007 Microsoft Office System, Internet Security and Acceleration (ISA) Server 2004 SP3 and 2006 SP1, and Office Small Business Accounting 2006 does not properly allocate memory, which allows remote attackers to execute arbitrary code via unspecified vectors that trigger "system state" corruption, aka "Office Web Components Memory Allocation Vulnerability."
How severe is CVE-2009-0562?: CVE-2009-0562 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2009-0562 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 26% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-0562?: CVE-2009-0562 primarily affects Microsoft Isa Server. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-0562?: 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-2009-0562 published?: CVE-2009-0562 was published on 2009-08-12 and last updated on 2026-06-16.

References

Affected products (11)

cpe:2.3:a:microsoft:isa_server:2004:sp3:enterprise:*:*:*:*:*
cpe:2.3:a:microsoft:isa_server:2004:sp3:standard:*:*:*:*:*
cpe:2.3:a:microsoft:isa_server:2006:sp1:enterprise:*:*:*:*:*
cpe:2.3:a:microsoft:isa_server:2006:sp1:standard:*:*:*:*:*
cpe:2.3:a:microsoft:office:-:*:small_business_accounting_2006:*:*:*:*:*
cpe:2.3:a:microsoft:office:2003:sp3:*:*:*:*:*:*
cpe:2.3:a:microsoft:office:xp:sp3:*:*:*:*:*:*
cpe:2.3:a:microsoft:office_web_components:2000:sp3:*:*:*:*:*:*
cpe:2.3:a:microsoft:office_web_components:2003:sp1:2007_microsoft_office:*:*:*:*:*
cpe:2.3:a:microsoft:office_web_components:2003:sp3:*:*:*:*:*:*
cpe:2.3:a:microsoft:office_web_components:xp:sp3:*:*:*:*:*:*

More vulnerabilities in Microsoft Isa Server

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CVE-2015-0339 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2015-0335 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2015-0333 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2014-4121 — Critical (CVSS 10.0): Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, 4.5, 4.5.1, and 4.5.2 does not properly parse internationalized…
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