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CVE-2010-3962 is a memory corruption vulnerability affecting Microsoft Internet Explorer 6, 7, and 8. Crafted web content involving Cascading Style Sheets (CSS) token sequences and the clip attribute can trigger arbitrary code execution. The flaw is classified as use-after-free and is also known as an invalid flag reference issue or Uninitialized Memory Corruption Vulnerability. Technical descriptions additionally identify insufficient memory allocation while parsing particular CSS tag combinations, resulting in an overwrite of the least significant byte of a vtable pointer. The vulnerability was exploited in the wild in November 2010 and added to CISA’s Known Exploited Vulnerabilities Catalog in October 2025.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (2 hidden).
This repository contains a single Metasploit module (ms10_090_ie_css_clip.rb) that exploits a memory corruption vulnerability (CVE-2010-3962) in Microsoft Internet Explorer's mshtml.dll when parsing specially crafted CSS tags. The exploit is delivered via a malicious HTML page served by the Metasploit HTTP server. When a vulnerable version of Internet Explorer (6 or 7) visits the page, JavaScript is used to perform a heap spray and trigger the vulnerability, resulting in arbitrary code execution. The module supports customizable payloads (such as reverse shells or meterpreter sessions) and automatically targets the victim's browser version based on the User-Agent string. The exploit is operational and weaponized for use within the Metasploit framework, requiring the victim to visit the attacker's server with a vulnerable browser.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A use-after-free vulnerability in Microsoft Internet Explorer 6, 7, and 8 enables remote arbitrary code execution through CSS token sequences and the clip attribute. The record confirms exploitation in the wild in November 2010 and references public exploits.
A use-after-free memory corruption vulnerability in Internet Explorer 6–8 that enables remote code execution via crafted web content.
A historical Internet Explorer zero-day (IE6–IE8) referenced as previously used to deliver the Pirpi backdoor payload.
A historical Internet Explorer zero-day (IE6–IE8) previously used to deliver the Pirpi backdoor payload.
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.