What is CVE-2009-2529?

CVE-2009-2529 is a high-severity vulnerability in Microsoft Internet Explorer, classified under Code Injection. CVSS score: 8.1/10. Published 2009-10-14.

How severe is CVE-2009-2529?

High severity. CVSS v3 base score is 8.1 out of 10.

RCE in Microsoft Internet Explorer

CVE-2009-2529

Microsoft Internet Explorer 5.01 SP4, 6, 6 SP1, 7, and 8 does not properly handle argument validation for unspecified variables, which allows remote attackers to execute arbitrary code via a crafted HTML document, aka "HTML Component Handling Vulnerability."

Vulnerability class: RCE (Remote Code Execution)

Published 2009-10-14 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.195 (97.3th percentile), scored 2026-10-01.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.195 · newest: 0.195 · change: 0.000

Affected products

Microsoft Internet Explorer — versions 5.01, 6, 7
Microsoft Windows 2000
Microsoft Windows 7
Microsoft Windows Server 2003
Microsoft Windows Server 2008
Microsoft Windows Vista
Microsoft Windows Xp

Weakness classification (CWE)

CWE-94 — Code Injection

References

docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-054 (vendor-advisory)
www.us-cert.gov/cas/techalerts/TA09-286A.html (US Government Resource, third-party-advisory)
oval.cisecurity.org/repository/search/definition/oval:org.mitre.oval:def:6419 (signature, vdb-entry)

Frequently asked questions

What is CVE-2009-2529?: CVE-2009-2529 is a high-severity vulnerability in Microsoft Internet Explorer, classified under Code Injection. CVSS score: 8.1/10. Published 2009-10-14.
How severe is CVE-2009-2529?: High severity. CVSS v3 base score is 8.1 out of 10.