Reference page — cumulative record through Wednesday, October 7, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2020-0878
Microsoft Browser Memory Corruption Vulnerability
AV AC PR UI S C I A CVSS EPSS %ile KEV
N H N R U L L N 4.2 .0270 85.4 YES
AFFECTED
Product Versions Fixed
ChakraCore unspecified —
Microsoft Edge (EdgeHTML-based) 1.0..0 – —
Internet Explorer 9 1.0.0 – —
Internet Explorer 11 1.0.0 – —
TIMELINE
Nov 4 Reserved by microsoft
Sep 11 Published (CNA: microsoft)
Nov 3 Added to CISA KEV, remediation due 2022-05-03
Description
<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>
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| November 4, 2019 | Reserved | Reserved by microsoft |
| September 11, 2020 | Published | Published (CNA: microsoft) |
| November 3, 2021 | KEV ADDED | Added to CISA KEV, remediation due 2022-05-03 |
Affected
Affected products and packages — 4 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Microsoft | ChakraCore | — | — | — |
| Microsoft | Microsoft Edge (EdgeHTML-based) | — | 1.0..0 | — |
| Microsoft | Internet Explorer 9 | — | 1.0.0 | — |
| Microsoft | Internet Explorer 11 | — | 1.0.0 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2020-0878 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, October 7, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
