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CVE-2003-0838 is a vulnerability in Microsoft Internet Explorer that allows remote attackers to bypass security zone restrictions by creating a popup window and injecting ActiveX object code using a 'data' tag that references malicious code. Internet Explorer initially treats the content as HTML or JavaScript, but subsequently executes it as an HTA (HTML Application), enabling arbitrary code execution. This vulnerability is distinct from CVE-2003-0532 and was exploited in the wild by the QHosts Trojan (also known as Trojan.Qhosts, QHosts-1, VBS.QHOSTS, or aolfix.exe).
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
No public activity tracked yet. Mallory keeps watching.
No public activity observed for this vulnerability.
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.
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