Use-after-free RCE in Microsoft Internet Explorer 6 through 11
CVE-2014-1776 is a use-after-free vulnerability in Microsoft Internet Explorer 6 through 11 involving CMarkup::IsConnectedToPrimaryMarkup. A remote attacker can trigger memory corruption by causing Internet Explorer to access freed memory, leading to application instability or controlled code execution. Public reporting from FireEye described in-the-wild exploitation in 2014 against IE9 through IE11 using a browser-based exploit chain that combined the IE use-after-free with Adobe Flash to obtain arbitrary memory access, bypass ASLR and DEP, build a runtime ROP chain, and execute shellcode. The shellcode then downloaded a next-stage payload. Microsoft clarified that although early reporting emphasized VGX.DLL, the vulnerable code was not in VGX.DLL; disabling VGX.DLL only blocked the then-current exploit technique.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A then-zero-day use-after-free vulnerability in Microsoft Internet Explorer (affecting IE6–IE11; exploit targeting IE9–IE11) leveraged with Flash heap manipulation to achieve arbitrary memory access and ultimately code execution, including bypass of ASLR and DEP via ROP.
A targeted Internet Explorer use-after-free zero-day (affecting IE6–IE11; exploit targeting IE9–IE11) that achieves arbitrary memory access and bypasses ASLR/DEP via a Flash-assisted exploitation chain and ROP, leading to code execution.
An Internet Explorer vulnerability exploited for code execution.
An Internet Explorer client-side vulnerability exploited by APT3 for client execution (initial compromise).
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.