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CVE-2021-33742 is a remote code execution vulnerability in Windows MSHTML, the rendering component used by Internet Explorer. It was exploited as a zero-day in targeted attacks associated with Candiru. An April 2021 campaign used malicious Microsoft Office documents that loaded Internet Explorer content through ActiveX objects or VBA macros, then delivered the exploit after fingerprinting targets. Exploitation does not require prior authentication or privileges on the vulnerable device. Microsoft patched the vulnerability in June 2021. The specific vulnerable function and underlying weakness are not established.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Microsoft Office exploit that Google linked to the same operator discussed in the report, believed associated with Candiru.
An Internet Explorer zero-day exploited in a targeted campaign (malicious Office documents leading to IE content) and later patched by Microsoft.
An Internet Explorer remote code execution exploit referenced as being used by Candiru for drive-by compromise via a crafted URL.
A remote code execution zero-day in the Windows MSHTML component used by Internet Explorer, highlighted as actively exploited in targeted attacks and notable for suspected development by a commercial exploit broker.
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.