Out-of-bounds read in Microsoft Word
Priority LOW 35CWE-125Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-125 and the CVSS impact.
Summary
An information disclosure vulnerability exists when Microsoft Office software reads out of bound memory due to an uninitialized variable, which could disclose the contents of memory, aka "Microsoft Office Information Disclosure Vulnerability." This affects Word, Microsoft SharePoint Server, Microsoft Office Word Viewer, Microsoft Excel Viewer, Microsoft SharePoint, Microsoft Office.
Why it matters now
EPSS 0.07306 94th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Microsoft | Word | Automation Services on Microsoft SharePoint Server 2010 Service Pack 2 | — | No fix listed | CNA |
| Microsoft | Microsoft SharePoint Server | 2013 Service Pack 1 | — | No fix listed | CNA |
| Microsoft | Microsoft Office Word Viewer | Microsoft Office Word Viewer | — | No fix listed | CNA |
| Microsoft | Microsoft Excel Viewer | 2007 Service Pack 3 | — | No fix listed | CNA |
| Microsoft | Microsoft SharePoint | Enterprise Server 2013 Service Pack 1; Enterprise Server 2016 | — | No fix listed | CNA |
| Microsoft | Microsoft Office | 2010 Service Pack 2 (32-bit editions); 2010 Service Pack 2 (64-bit editions); 2013 RT Service Pack 1; 2013 Service Pack 1 (32-bit editions); 2013 Service Pack 1 (64-bit editions); 2016 (32-bit edition); 2016 (64-bit edition); 2016 Click-to-Run (C2R) for 32-bit editions; 2016 Click-to-Run (C2R) for 64-bit editions; Web Apps 2010 Service Pack 2; Web Apps 2013 Service Pack 1 | — | No fix listed | CNA |
- Word VendorMicrosoft Affected Automation Services on Microsoft SharePoint Server 2010 Service Pack 2 Fixed in — No fix listed CNA
- Microsoft SharePoint Server VendorMicrosoft Affected 2013 Service Pack 1 Fixed in — No fix listed CNA
- Microsoft Office Word Viewer VendorMicrosoft Affected Microsoft Office Word Viewer Fixed in — No fix listed CNA
- Microsoft Excel Viewer VendorMicrosoft Affected 2007 Service Pack 3 Fixed in — No fix listed CNA
- Microsoft SharePoint VendorMicrosoft Affected Enterprise Server 2013 Service Pack 1; Enterprise Server 2016 Fixed in — No fix listed CNA
- Microsoft Office VendorMicrosoft Affected 2010 Service Pack 2 (32-bit editions); 2010 Service Pack 2 (64-bit editions); 2013 RT Service Pack 1; 2013 Service Pack 1 (32-bit editions); 2013 Service Pack 1 (64-bit editions); 2016 (32-bit edition); 2016 (64-bit edition); 2016 Click-to-Run (C2R) for 32-bit editions; 2016 Click-to-Run (C2R) for 64-bit editions; Web Apps 2010 Service Pack 2; Web Apps 2013 Service Pack 1 Fixed in — No fix listed CNA
CPE configurations NVD · 15
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:microsoft:excel_viewer:2007:sp3:*:*:*:*:*:* | 2007 sp3 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:office:2010:sp2:*:*:*:*:*:* | 2010 sp2 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:office:2013:sp1:*:*:*:*:*:* | 2013 sp1 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:office:2013:sp1:*:*:rt:*:*:* | 2013 sp1 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:*:* | 2016 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:office:2016:*:*:*:click-to-run:*:*:* | 2016 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:office_compatibility_pack:-:sp3:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:office_web_apps:2010:sp2:*:*:*:*:*:* | 2010 sp2 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:office_web_apps:2013:sp1:*:*:*:*:*:* | 2013 sp1 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:office_word_viewer:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
- cpe:2.3:a:microsoft:excel_viewer:2007:sp3:*:*:*:*:*:* Versions 2007 sp3 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:office:2010:sp2:*:*:*:*:*:* Versions 2010 sp2 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:office:2013:sp1:*:*:*:*:*:* Versions 2013 sp1 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:office:2013:sp1:*:*:rt:*:*:* Versions 2013 sp1 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:*:* Versions 2016 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:office:2016:*:*:*:click-to-run:*:*:* Versions 2016 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:office_compatibility_pack:-:sp3:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:office_web_apps:2010:sp2:*:*:*:*:*:* Versions 2010 sp2 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:office_web_apps:2013:sp1:*:*:*:*:*:* Versions 2013 sp1 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:office_word_viewer:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
Show 5 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:microsoft:sharepoint_enterprise_server_2013:-:sp1:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:sharepoint_enterprise_server_2016:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:sharepoint_server:2013:sp1:*:*:*:*:*:* | 2013 sp1 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:word_automation_services:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:sharepoint_server:2010:sp2:*:*:*:*:*:* | 2010 sp2 | Running on | Microsoft |
- cpe:2.3:a:microsoft:sharepoint_enterprise_server_2013:-:sp1:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:sharepoint_enterprise_server_2016:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:sharepoint_server:2013:sp1:*:*:*:*:*:* Versions 2013 sp1 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:word_automation_services:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:sharepoint_server:2010:sp2:*:*:*:*:*:* Versions 2010 sp2 Running on ·Microsoft
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2018-8378
- 2026-10-03 Alias added: GHSA-q4j3-h8qw-m7m4
More Microsoft Excel Viewer vulnerabilities
- TI-2019-00335 Command injection in Microsoft Office 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-2009-00222 Microsoft Office Excel 2000 SP3, 2002 SP3, 2003 SP3, and 2007 SP1; Excel Viewer 2003 Gold… KEVCVSS 3.1HIGH 8.8
- TI-2007-00655 Unspecified vulnerability in Microsoft Excel 2000, XP, 2003, and 2004 for Mac, and… KEVCVSS 3.1HIGH 8.8
- TI-2016-06250 Microsoft Excel 2007 SP3, Excel 2010 SP2, Excel 2013 SP1, Excel 2013 RT SP1, Excel 2016… KEVCVSS 3.1HIGH 7.8
- TI-2013-03410 GDI+ in Microsoft Windows Vista SP2 and Server 2008 SP2; Office 2003 SP3, 2007 SP3, and… KEVCVSS 3.1HIGH 7.8
Sources
- CVE-2018-8378 · CVE Program
- CVE-2018-8378 · NVD
- FIRST EPSS
- GHSA-q4j3-h8qw-m7m4 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences