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Microsoft Office

CVE-2020-1229 — Microsoft Outlook Security Feature Bypass Vulnerability

Important CVSS 4.3 EPSS 0.03844 2020-06 archive

Executive Summary

A security feature bypass vulnerability exists in Microsoft Outlook when Office fails to enforce security settings configured on a system. An attacker who successfully exploited this vulnerability could cause a system to load remote images. These images could disclose the IP address of the targeted system to the attacker. Exploitation of the vulnerability requires that a user open a specially crafted image with an affected version of Microsoft Office software. In an email attack scenario, an attacker could exploit the vulnerability by sending the specially crafted image to the user. The update addresses the vulnerability by changing how remote images are processed in Outlook.

Overview

4.3
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Security Feature Bypass
Released Jun 9 2020
Last Updated Jun 9 2020
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.03844 — 0.88758 percentile
NVD CVSS 4.3 MEDIUM — differs from MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged

EPSS Score

0.03844
probability of exploitation in the next 30 days
0.88758 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

6 affected products
Product KB Article Severity Impact Restart Required
Microsoft 365 Apps for Enterprise for 32-bit Systems Click to Run (Security Update) Important Security Feature Bypass No
Microsoft 365 Apps for Enterprise for 64-bit Systems Click to Run (Security Update) Important Security Feature Bypass No
Microsoft Office 2010 Service Pack 2 (32-bit editions) 4484373 (Security Update) 4484378 (Security Update) 4484373 (Security Update) 4484378 (Security Update) Important Security Feature Bypass 4484126 4484294 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft Office 2010 Service Pack 2 (64-bit editions) 4484373 (Security Update) 4484378 (Security Update) 4484373 (Security Update) 4484378 (Security Update) Important Security Feature Bypass 4484126 4484294 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft Office 2013 RT Service Pack 1 4484351 (Security Update) 4484351 (Security Update) 4484351 (Security Update) Important Security Feature Bypass 4484117 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft Office 2013 Service Pack 1 (32-bit editions) 4484351 (Security Update) 4484351 (Security Update) 4484351 (Security Update) Important Security Feature Bypass 4484117 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft Office 2013 Service Pack 1 (64-bit editions) 4484351 (Security Update) 4484351 (Security Update) 4484351 (Security Update) Important Security Feature Bypass 4484117 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft Office 2016 (32-bit edition) 4484342 (Security Update) 4484342 (Security Update) Important Security Feature Bypass 4484214 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft Office 2016 (64-bit edition) 4484342 (Security Update) 4484342 (Security Update) Important Security Feature Bypass 4484214 Base: N/A Temporal: N/A Vector: N/A Maybe None Microsoft Office 2016 for Mac Release Notes (Security Update) Important Security Feature Bypass No
Microsoft Office 2019 for 32-bit editions Click to Run (Security Update) Important Security Feature Bypass No
Microsoft Office 2019 for 64-bit editions Click to Run (Security Update) Important Security Feature Bypass No
Microsoft Office 2019 for Mac Release Notes (Security Update) Important Security Feature Bypass No

Patches

2 patches
Article Type Restart
Click to Run Security Update No
Release Notes Security Update No

Known Exploits

Acknowledgments

MegaInfo

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