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CVE-2020-1380 is a use-after-free vulnerability in Internet Explorer's JScript9 scripting engine caused by JIT optimization and missing checks in JIT-compiled code paths. Specially crafted JavaScript can corrupt memory, establish arbitrary read/write access within the browser process, and execute arbitrary code in the current user's context. Delivery vectors include malicious or compromised websites, advertisements, and applications or Microsoft Office documents hosting the Internet Explorer rendering engine. Reliable exploitation was demonstrated against Internet Explorer 11 on Windows 10 build 18363 x64. The vulnerability was exploited in the wild and patched on August 11, 2020.
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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 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 exploited by the North Korea-linked InkySquid group in watering-hole attacks involving the Daily NK news website. Attackers concealed malicious JavaScript among legitimate code and used encoded SVG content to store key strings and an initial payload.
An Internet Explorer vulnerability referenced as one of the exploits used by the Bottle exploit kit in an earlier related Cinobi delivery campaign.
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.