CVEs / CVE-2020-1380

CVE-2020-1380: Microsoft Internet Explorer Scripting Engine Memory Corruption Vulnerability

• Known exploited in the CISA KEV catalog since 3 Nov 2021
• high 7.6 CVSS 2.0 (NVD)
• EPSS 24.1% chance of exploitation in the next 30 days, higher than 97% of CVEs (30 Oct 2026)
• Last changed at its sources 17 Jun 2026

Summary

Microsoft Internet Explorer contains a memory corruption vulnerability which can allow for remote code execution in the context of the current user.

Description

A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer. 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 that is designed to exploit the vulnerability through Internet Explorer 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 IE 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 and fixed versions

Exploitation

Severity

References

• CVE-2020-1380 on NVD
• CVE-2020-1380 in the CISA KEV catalog
• http://packetstormsecurity.com/files/163056/Internet-Explorer-jscript9.dll-Memory-Corruption.html Third Party Advisory, VDB Entry
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1380 Patch, Vendor Advisory
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-1380 US Government Resource