Vulnerability in Microsoft Internet Explorer

CVE-2011-1266

The Vector Markup Language (VML) implementation in vgx.dll in Microsoft Internet Explorer 6 through 8 does not properly handle objects in memory, which allows remote attackers to execute arbitrary code by accessing an object that (1) was not properly initialized or (2) is deleted, aka "VML Memory Corruption Vulnerability."

Published 2011-06-16 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 9.3 (High). Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.180 (97.1th percentile), scored 2026-09-29.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.180 · newest: 0.180 · change: 0.000

Affected products

Microsoft Internet Explorer — versions 6, 7, 8
Microsoft Windows 7
Microsoft Windows Server 2003
Microsoft Windows Server 2008 — versions r2
Microsoft Windows Vista
Microsoft Windows Xp

Weakness classification (CWE)

CWE-908 — Use of Uninitialized Resource

References

oval.cisecurity.org/repository/search/definition/oval:org.mitre.oval:def:12593 (Tool Signature, signature, vdb-entry)
docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-052 (vendor-advisory, Patch, Vendor Advisory)