CVE-2022-41128 is a remote code execution vulnerability in Microsoft Windows Scripting Languages affecting the JScript9 engine used by Internet Explorer and Internet Explorer rendering paths in Microsoft Office. The flaw resides in jscript9.dll and was described as a type confusion issue caused by incorrect JIT optimization. When an affected system renders attacker-controlled web content, memory corruption can occur and arbitrary code may be executed in the context of the current user. Observed exploitation used malicious Office documents that retrieved a remote RTF template and then attacker-controlled HTML content rendered through Internet Explorer, enabling exploitation even when Internet Explorer was not the default browser.
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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.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability referenced as an Internet Explorer flaw, reported here as exploited by TA-RedAnt during a spear-phishing campaign that delivered RokRAT via LNK files inside a compressed archive.
A patched remote code execution vulnerability in jscript9.dll, the Internet Explorer JavaScript engine, used in targeted attacks via malicious Office documents that fetched remote RTF/HTML content.
An Internet Explorer vulnerability cited as an example of prior zero-day exploitation by APT37; it is background context rather than the main subject of this report.
A remote code execution vulnerability in Windows Scripting Languages exploited by ScarCruft.
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.