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CVE-2019-1005: Scripting Engine Memory Corruption Vulnerability

• Severity: high (CVSS 7.6 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-06-12 · updated 2026-06-17
• Weakness: CWE-787

Description

A remote code execution vulnerability exists in the way the scripting engine handles objects in memory in Microsoft browsers. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. In a web-based attack scenario, an attacker could host a specially crafted website designed to exploit the vulnerability through a Microsoft browser and then convince a user to view the website. An attacker could also embed an ActiveX control marked "safe for initialization" in an application or Microsoft Office document that hosts the browser rendering engine. The attacker could also take advantage of compromised websites and websites that accept or host user-provided content or advertisements. These websites could contain specially crafted content that could exploit the vulnerability. The security update addresses the vulnerability by modifying how the scripting engine handles objects in memory.

Affected products

• Microsoft Internet Explorer 11: 9, 10, 11
• Microsoft Internet Explorer 11: from 1.0.0 before publication — fixed in publication
• Microsoft Internet Explorer 10: from 1.0.0 before publication — fixed in publication
• Microsoft Internet Explorer 9: from 1.0.0 before publication — fixed in publication

How to fix

Upgrade to a fixed version: Microsoft Internet Explorer 11 publication; Microsoft Internet Explorer 10 publication; Microsoft Internet Explorer 9 publication. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-1005
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1005

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