CVE-2014-1776: Microsoft Internet Explorer Memory Corruption Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2022-01-28. EPSS: 82.7% chance of exploitation in the next 30 days.

Use-after-free vulnerability in Microsoft Internet Explorer 6 through 11 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via vectors related to the CMarkup::IsConnectedToPrimaryMarkup function, as exploited in the wild in April 2014. NOTE: this issue originally emphasized VGX.DLL, but Microsoft clarified that "VGX.DLL does not contain the vulnerable code leveraged in this exploit. Disabling VGX.DLL is an exploit-specific workaround that provides an immediate, effective workaround to help block known attacks."

Affected products

• Microsoft Internet Explorer: version 6 only; version 7 only; version 8 only; version 9 only; version 10 only; version 11 only

Published 2014-04-27. Last modified 2026-06-17.