CVE-2018-0802VulnerabilityPublished 11/03/2021Updated 10/24/2026

CVE-2018-0802: 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
Ransomware: Used in ransomware campaigns
EPSS: 93.3% 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-2018-0802 (opens in a new tab)

Description

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

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 is known to be exploited in the wild and has been used in ransomware campaigns. It is also known to be chained with CVE-2018-0798, potentially increasing its impact. No specific affected versions or patch information is provided in the input data.

Impact

Exploitation of this vulnerability allows attackers to execute arbitrary code remotely within the security context of the current user. This can lead to full compromise of the affected system if the user has elevated privileges. The vulnerability has been actively exploited in the wild and used in ransomware campaigns, indicating a significant real-world impact.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch is applied, users should exercise caution when opening untrusted Office documents and consider applying any available security updates from Microsoft. No vendor advisory or official fix information is provided in the input data.

Weaknesses

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

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 09:11:41 UTC

Weaknesses

References

Related threats