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Vulnerability Intelligence Report
Microsoft Browser Memory Corruption Vulnerability

CVE-2020-0878

<p>A remote code execution vulnerability exists in the way that Microsoft browsers access objects in memory. The vulnerability could corrupt memory in a way that could allow an attacker to 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, the attacker 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.</p> <p>An attacker could host a specially crafted website that is designed to exploit the vulnerability through Microsoft browsers, and then convince a user to view the website. The attacker could also take advantage of compromised websites, or websites that accept or host user-provided content or advertisements, by adding specially crafted content that could exploit the vulnerability. In all cases, however, an attacker would have no way to force users to view the attacker-controlled content. Instead, an attacker would have to convince users to take action, typically via an enticement in email or instant message, or by getting them to open an email attachment.</p> <p>The security update addresses the vulnerability by modifying how Microsoft browsers handle objects in memory.</p>

CISA KEV SSVC: Active Exploitation
CVSS Base Score
4.2
MEDIUM
Exploitability:1.7
Impact Score:2.6
EPSS Probability:2.70%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
Authentication
Weaponization
SSVC Action

Weaknesses (CWE)

CWE-787 ↗CWE-787 Out-of-bounds Write

Affected Products & Versions

Vendor Product Affected Versions
Microsoft ChakraCore 0 < publication (affected)
Microsoft Microsoft Edge (EdgeHTML-based) 1.0..0 < publication (affected)
Microsoft Internet Explorer 9 1.0.0 < publication (affected)
Microsoft Internet Explorer 11 1.0.0 < publication (affected)

References & Technical Advisories

No reference links found.

Threat Intelligence Signals

CISA KEV
ACTIVE IN CATALOG
EPSS Score
2.696%

Identity & Timeline

StatusPUBLISHED
Assigning AuthorityMicrosoft Corporation · Vendor · USA
Reserved2019-11-04T00:00:00
Published2020-09-11T17:08:26
Patch Date2020-09-08
Last Updated2025-10-21T23:35:36

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