# CVE-2020-0878: Microsoft Browser Memory Corruption Vulnerability

> CVE-2020-0878: Microsoft Browser Memory Corruption Vulnerability. CVSS 4.2 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2020-0878
Last updated: 2025-10-21T23:35:36Z

- Published: 2020-09-11 17:08 UTC · Updated: 2025-10-21 23:35 UTC · Assigner: microsoft
- CVSS: 4.2 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C
- EPSS: 2.7%, 86th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2022-05-03, ransomware use: Known

## 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\>

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Microsoft: ChakraCore
- Microsoft: Internet Explorer 11
- Microsoft: Internet Explorer 9
- Microsoft: Microsoft Edge (EdgeHTML-based)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2020-0878)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2020-0878)
- [https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0878](https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0878)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2020-0878 · Markdown: https://rewindex.com/cve/CVE-2020-0878.md · JSON: https://rewindex.com/api/v1/cves/CVE-2020-0878 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:09:41.645Z