CVE-2023-33131Public exploitNetwork attack vector

Remote code execution via undisclosed code injection

Published Jun 13, 2023 · Updated Feb 28, 2025

Code injection in affected Microsoft Office and Outlook releases allows remote attackers to execute code after user interaction. Microsoft has not disclosed the vulnerable Outlook component or the operation performed incorrectly on attacker-controlled input. Successful exploitation requires user interaction and runs code in the affected user's security context.

CVSS severity8.8
High
EPSS probability5.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in affected Microsoft Office and Outlook releases allows remote attackers to execute code after user interaction. Microsoft has not disclosed the vulnerable Outlook component or the operation performed incorrectly on attacker-controlled input. Successful exploitation requires user interaction and runs code in the affected user's security context.

The record

CVE
CVE-2023-33131
Published
Jun 13, 2023
Updated
Feb 28, 2025
Vendor
Microsoft
Product
Microsoft Office 2019
Classifications
CWE-94
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 28, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=19.0.0 <https://aka.ms/OfficeSecurityReleases

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Office 2019version=19.0.0 <https://aka.ms/OfficeSecurityReleases
Microsoft · Microsoft Outlook 2016version=16.0.0.0 <16.0.5400.1000
Microsoft · Microsoft Office LTSC 2021version=16.0.1 <https://aka.ms/OfficeSecurityReleases
Microsoft · Microsoft Outlook 2013version=14.0.0 <15.0.5563.1000; version=15.0.0.0 <15.0.5563.1000
Microsoft · Microsoft 365 Apps for enterpriseversion=16.0.1 <https://aka.ms/OfficeSecurityReleases

Published CVSS scores

8.8Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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