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Vulnerabilities

Vulnerability · CVE-2020-0878

Microsoft Edge and Internet Explorer Memory Corruption Vulnerability

Published Sep 11, 2020 · catalog updated Jun 16, 2026 · Microsoft Edge and Internet Explorer

Patch now

CVE-2020-0878 is in the CISA known-exploited catalog, due May 3, 2022. Confirm Microsoft Edge and Internet Explorer against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Medium4.2
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
2.70%
Remediation
Remediation guidance
Affected products
cpe microsoft/chakracore · cpe microsoft/edge · cpe microsoft/internet explorer · vendor Microsoft Edge and Internet Explorer

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. 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. The security update addresses the vulnerability by modifying how Microsoft browsers handle objects in memory.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/chakracoreversion unspecified
  • cpe microsoft/edgeversion unspecified
  • cpe microsoft/internet explorer11
  • cpe microsoft/internet explorer9
  • vendor Microsoft Edge and Internet Explorerversion unspecified

How to fix CVE-2020-0878

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2020-0878 is in the CISA known-exploited catalog, due May 3, 2022. Confirm Microsoft Edge and Internet Explorer against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with microsoft/internet explorer 11; microsoft/internet explorer 9. Apply updates per vendor instructions.

What should an analyst verify?

CWE-787: Out-of-bounds Write. EPSS 2.70%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 11, 2020 · Catalog

    Detected

    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 adminis

  2. Nov 3, 2021 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. May 3, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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 adminis

Sources

  • CISA KEVConfirmed exploitationCVE-2020-0878

    Microsoft Edge and Internet Explorer contain a memory corruption vulnerability that allows attackers to execute code in the context of the current user.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2020-0878

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2020-0878

    30-day exploitation probability 2.7%

    first.org
  • NIST NVDVulnerability recordCVE-2020-0878

    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 exp

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2020-0878

    Microsoft Edge and Internet Explorer contain a memory corruption vulnerability that allows attackers to execute code in the context of the current user.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.