Code execution via uninitialized Graph COM memory
Published Mar 11, 2021 · Updated Aug 19, 2026
Remote code execution in Microsoft Office products allows remote attackers to execute code when a user opens a malicious file or page. The Graph COM object accesses memory that was not properly initialized, allowing crafted content to redirect execution in the current process. Exploitation requires user interaction, and resulting code runs with the privileges of the affected Office process.
Summary
What happened
Remote code execution in Microsoft Office products allows remote attackers to execute code when a user opens a malicious file or page. The Graph COM object accesses memory that was not properly initialized, allowing crafted content to redirect execution in the current process. Exploitation requires user interaction, and resulting code runs with the privileges of the affected Office process.
The record
- CVE
- CVE-2021-27057
- Published
- Mar 11, 2021
- Updated
- Aug 19, 2026
- Vendor
- Microsoft
- Product
- Microsoft Office 2016
- Classifications
- T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 11, 2021CVE publishedPublication date reported by the CVE source.
- Aug 19, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=16.0.0 <16.0.5134.1000
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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