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CVE-2020-1380 is a remote code execution vulnerability in Internet Explorer 11 caused by improper handling of objects in memory by the scripting engine, specifically jscript9.dll. Available technical reporting identifies the flaw as a JScript use-after-free condition associated with JIT-compiled code paths, leading to memory corruption. By triggering the bug with specially crafted script content, an attacker can corrupt memory and achieve arbitrary read/write within the browser process, bypass protections such as Control Flow Guard through additional exploitation steps, and ultimately execute arbitrary code in the security context of the current user. Exploitation has been observed in web-based attacks in which a victim is induced to visit a malicious or compromised website, and it can also be reached through applications or Microsoft Office documents that host the Internet Explorer rendering engine, including scenarios involving an ActiveX control marked safe for initialization.
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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.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A memory corruption vulnerability in the Windows Scripting Engine that allows remote code execution, previously exploited by ScarCruft.
An Internet Explorer client-execution vulnerability used by ScarCruft during the watering-hole attack chain that ultimately led to BLUELIGHT and then Dolphin deployment.
An Internet Explorer vulnerability referenced as one of the exploits used by the Bottle exploit kit in an earlier related Cinobi delivery campaign.
An Internet Explorer vulnerability used by the Bottle exploit kit in observed drive-by download activity.
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.