CVE-2018-0798VulnerabilityPublished 11/03/2021Updated 10/24/2026

CVE-2018-0798: Microsoft Office Memory Corruption Vulnerability

Affects Microsoft OfficeSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 11/03/2021
KEV deadline: 05/03/2022
EPSS: 95.1% chance of exploitation in 30 days – higher than 99% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2018-0798 (opens in a new tab)

Description

CVE-2018-0798 is a memory corruption vulnerability in Microsoft Office that allows remote code execution in the context of the current user. It arises from improper handling of objects in memory. This vulnerability has been exploited in the wild and is known to be chained with CVE-2018-0802.

Summary

Microsoft Office contains a memory corruption vulnerability (CWE-787) due to improper handling of objects in memory. Successful exploitation enables remote code execution with the privileges of the current user. This vulnerability has been observed in active exploitation campaigns and is often chained with CVE-2018-0802 to enhance attack impact.

Impact

Exploitation of this vulnerability allows attackers to execute arbitrary code remotely on affected systems with the privileges of the current user. This can lead to compromise of the user's environment and potentially further system compromise depending on user permissions.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.

Weaknesses

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

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 09:11:44 UTC

Weaknesses

References

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