Scripting Engine Memory Corruption RCE in Internet Explorer
CVE-2019-1367 is a remote code execution vulnerability in the legacy JScript scripting engine used by Internet Explorer 8, 9, 10, and 11. The issue is described as a memory corruption flaw in jscript.dll. Supporting content indicates the root cause is improper garbage-collector tracking of JScript VAR structures, specifically involving function arguments during an Array.sort callback, and that this bug class also involved abuse of the Enumerator object. When Internet Explorer processes attacker-controlled script content, the scripting engine can mishandle object lifetime in memory, leading to use-after-free style corruption and allowing arbitrary code execution in the context of the browser process.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remote code execution vulnerability in Internet Explorer's jscript.dll caused by improper garbage collection tracking of JScript variables/function arguments, actively exploited in the wild and used by both an APT and an exploit kit.
An Internet Explorer legacy JScript engine vulnerability exploited as a zero-day and later used by the Magnitude Exploit Kit to deliver payloads (including ransomware) via malvertising.
An Internet Explorer vulnerability (used here via a malicious script) exploited by the DarkHotel APT in a targeted, multi-stage infection chain to selectively deliver a final backdoor to high-value victims.
The version that knows your environment.
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.