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CVE-2019-1429 is a remote code execution vulnerability in the Internet Explorer scripting engine caused by improper handling of objects in memory. Available reporting places it in the legacy JScript bug class involving variables or arguments not being properly tracked by the garbage collector, leading to memory corruption and use-after-free conditions during script execution. It was described as a variant identified through analysis of CVE-2019-1367, and was released to address shortcomings in the earlier CVE-2019-1367 fix as well as a related variant involving callback handling. Successful exploitation occurs when Internet Explorer processes specially crafted script content, allowing attacker-controlled memory corruption within the browser process.
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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.
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Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A related variant discovered through variant analysis of CVE-2019-1367.
An Internet Explorer JScript variant involving untracked arguments in the toJSON callback; discussed as an incomplete-fix follow-on closely related to CVE-2020-0674.
An Internet Explorer legacy JScript engine vulnerability referenced as an in-the-wild zero-day in the context of exploit kit evolution.
Internet Explorer legacy JScript (jscript.dll) vulnerability previously used in in-the-wild IE exploitation chains (mentioned for contrast with CVE-2020-1380).
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.