CVE-2020-0878VulnerabilityPublished 11/03/2021Updated 10/24/2026

CVE-2020-0878: Microsoft Edge and Internet Explorer Memory Corruption Vulnerability

Affects Microsoft Edge and Internet ExplorerSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 11/03/2021
KEV deadline: 05/03/2022
Ransomware: Used in ransomware campaigns
EPSS: 2.7% chance of exploitation in 30 days – higher than 85% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2020-0878 (opens in a new tab)

Description

CVE-2020-0878 is a memory corruption vulnerability in Microsoft Edge and Internet Explorer that enables attackers to execute code with the privileges of the current user. This vulnerability has been exploited in the wild and is associated with known ransomware campaigns.

Summary

Microsoft Edge and Internet Explorer contain a memory corruption flaw (CWE-787) that allows remote attackers to execute arbitrary code in the context of the current user. This vulnerability has been actively exploited in the wild, including use in ransomware campaigns, indicating real-world impact and threat. No specific affected versions or patch information is provided in the input data.

Impact

Successful exploitation allows attackers to run arbitrary code with the same privileges as the current user, potentially leading to system compromise, data theft, or further malware deployment. The vulnerability has been exploited in the wild and linked to ransomware campaigns, confirming its high risk.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Users and administrators should monitor official Microsoft security advisories for updates and apply any available patches promptly. Until a fix is confirmed, consider limiting use of affected browsers or employing additional security controls to reduce exposure.

Weaknesses

CWE-787Out-of-bounds Write (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 09:20:06 UTC

Weaknesses

References

Related threats