Microsoft Office
CVE-2020-1229 — Microsoft Outlook Security Feature Bypass Vulnerability
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
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
0.89191 percentile - updated 2026-08-14
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 |
Exploits & PoC
No public exploit or PoC has been linked for this CVE yet. When available, references are sourced from public repositories and may be unverified or non-functional — review carefully before use.
Detection Rules
No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.
Acknowledgments
MegaInfo
References
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