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CVE-2021-33742 is a remote code execution vulnerability in the Windows MSHTML platform, the browser engine used by Internet Explorer and invoked by other Windows components such as Office content rendering paths. The flaw was exploited in the wild in 2021 and was observed in targeted attacks associated with Candiru-linked activity. Available reporting identifies the affected component as MSHTML but does not provide public technical detail on the precise vulnerable function or root cause. Exploitation was delivered after target profiling and has been linked to malicious Office-based attack chains as well as Internet Explorer exploitation. Microsoft patched the issue in June 2021.
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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.
4 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.