Microsoft Outlook Remote Code Execution Vulnerability
Priority MEDIUM 49CWE-94Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Microsoft. Impact type from Microsoft.
Summary
Microsoft Outlook Remote Code Execution Vulnerability
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.05718 93rd percentileScored 2026-11-07
Fix Fixed Microsoft: 2 updates
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Microsoft | Microsoft Office 2019 | 19.0.0 to before https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases | Patch available | CNA |
| Microsoft | Microsoft 365 Apps for Enterprise | 16.0.1 to before https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases | Patch available | CNA |
| Microsoft | Microsoft Office LTSC 2021 | 16.0.1 to before https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases | Patch available | CNA |
| Microsoft | Microsoft Outlook 2016 | 16.0.0.0 to before 16.0.5400.1000 | 16.0.5400.1000 | Patch available | CNA |
| Microsoft | Microsoft Outlook 2013 | 14.0.0 to before 15.0.5563.1000 | 15.0.5563.1000 | Patch available | CNA |
| Microsoft | Microsoft Outlook 2013 Service Pack 1 | 15.0.0.0 to before 15.0.5563.1000 | 15.0.5563.1000 | Patch available | CNA |
- Microsoft Office 2019 VendorMicrosoft Affected 19.0.0 to before https://aka.ms/OfficeSecurityReleases Fixed in https://aka.ms/OfficeSecurityReleases Patch available CNA
- Microsoft 365 Apps for Enterprise VendorMicrosoft Affected 16.0.1 to before https://aka.ms/OfficeSecurityReleases Fixed in https://aka.ms/OfficeSecurityReleases Patch available CNA
- Microsoft Office LTSC 2021 VendorMicrosoft Affected 16.0.1 to before https://aka.ms/OfficeSecurityReleases Fixed in https://aka.ms/OfficeSecurityReleases Patch available CNA
- Microsoft Outlook 2016 VendorMicrosoft Affected 16.0.0.0 to before 16.0.5400.1000 Fixed in 16.0.5400.1000 Patch available CNA
- Microsoft Outlook 2013 VendorMicrosoft Affected 14.0.0 to before 15.0.5563.1000 Fixed in 15.0.5563.1000 Patch available CNA
- Microsoft Outlook 2013 Service Pack 1 VendorMicrosoft Affected 15.0.0.0 to before 15.0.5563.1000 Fixed in 15.0.5563.1000 Patch available CNA
CPE configurations NVD · 9
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x64:* | 2019 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x86:* | 2019 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:*:x64:* | 2021 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:*:x86:* | 2021 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:outlook:2013:sp1:*:*:*:*:*:* | 2013 sp1 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:outlook:2013:sp1:*:*:rt:*:*:* | 2013 sp1 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:outlook:2016:*:*:*:*:*:x64:* | 2016 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:outlook:2016:*:*:*:*:*:x86:* | 2016 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:outlook_rt:2013:sp1:*:*:*:*:*:* | 2013 sp1 | Vulnerable | Microsoft |
- cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x64:* Versions 2019 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x86:* Versions 2019 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:*:x64:* Versions 2021 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:*:x86:* Versions 2021 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:outlook:2013:sp1:*:*:*:*:*:* Versions 2013 sp1 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:outlook:2013:sp1:*:*:rt:*:*:* Versions 2013 sp1 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:outlook:2016:*:*:*:*:*:x64:* Versions 2016 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:outlook:2016:*:*:*:*:*:x86:* Versions 2016 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:outlook_rt:2013:sp1:*:*:*:*:*:* Versions 2013 sp1 Vulnerable ·Microsoft
Remediation
Microsoft 2 updates
- Security Update
- Microsoft Outlook 2016 (32-bit edition) 16.0.5400.1000
- Microsoft Outlook 2016 (64-bit edition) 16.0.5400.1000
- Security Update
- Microsoft Outlook 2013 (32-bit editions) 15.0.5563.1000
- Microsoft Outlook 2013 (64-bit editions) 15.0.5563.1000
- Microsoft Outlook 2013 RT Service Pack 1 15.0.5563.1000
Vendor assessments
Microsoft
Microsoft's page for this CVE →
- Impact
- Remote Code Execution
- Exploited
- No
- Publicly disclosed
- No
- Exploitability
- Exploitation Less Likely
| Product | Status | Plan or fix |
|---|---|---|
| Microsoft 365 Apps for Enterprise for 32-bit Systems | Fixed | https · //aka.ms/OfficeSecurityReleases |
| Microsoft 365 Apps for Enterprise for 64-bit Systems | Fixed | https · //aka.ms/OfficeSecurityReleases |
| Microsoft Office 2019 for 32-bit editions | Fixed | https · //aka.ms/OfficeSecurityReleases |
| Microsoft Office 2019 for 64-bit editions | Fixed | https · //aka.ms/OfficeSecurityReleases |
| Microsoft Office LTSC 2021 for 32-bit editions | Fixed | https · //aka.ms/OfficeSecurityReleases |
| Microsoft Office LTSC 2021 for 64-bit editions | Fixed | https · //aka.ms/OfficeSecurityReleases |
Timeline
- 2026-10-02 Threatist record created from CVE-2023-33131
- 2026-10-03 Alias added: GHSA-pr4m-4844-x8pg
References
More Microsoft Office vulnerabilities
- TI-2023-09240 Microsoft Outlook Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2019-01013 A remote code execution vulnerability exists in Microsoft Excel software when the… KEVCVSS 3.1HIGH 8.8
- TI-2019-00335 Command injection in Microsoft Office KEVCVSS 3.1HIGH 8.8
- TI-2018-00739 Out-of-bounds write in Microsoft Equation Editor KEVCVSS 3.1HIGH 8.8
- TI-2015-02130 Microsoft PowerPoint 2007 SP3, Word 2007 SP3, PowerPoint 2010 SP2, Word 2010 SP2… KEVCVSS 3.1HIGH 8.8
- TI-2015-01588 Microsoft Office 2013 SP1 and 2013 RT SP1 allows remote attackers to execute arbitrary… KEVCVSS 3.1HIGH 8.8
Sources
- CVE-2023-33131 · CVE Program
- CVE-2023-33131 · NVD
- FIRST EPSS
- GHSA-pr4m-4844-x8pg · GitHub Advisory Database · CC BY 4.0
- CVE-2023-33131 · Microsoft Security Update Guide
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