CVE-2018-8378
An information disclosure vulnerability exists when Microsoft Office software reads out of bound memory due to an uninitialized variable,…
- 5.5MediumCVSS base score
- 7.3%Exploitation in 30 daysEPSS · top 5.6% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By microsoft
- 5 months later
· 5 months later
Published
- 6 years later
· 6 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | Medium5.5 | CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 7.3% · top 5.6% of all CVEs (9 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected Automation Services on Microsoft SharePoint Server 2010 Service Pack 2
Microsoft · Microsoft SharePoint Server
- affected 2013 Service Pack 1
Microsoft · Microsoft Office Word Viewer
- affected Microsoft Office Word Viewer
Microsoft · Microsoft Excel Viewer
- affected 2007 Service Pack 3
Microsoft · Microsoft SharePoint
- affected Enterprise Server 2013 Service Pack 1
- affected Enterprise Server 2016
- affected 2010 Service Pack 2 (32-bit editions)
- affected 2010 Service Pack 2 (64-bit editions)
- affected 2013 RT Service Pack 1
- affected 2013 Service Pack 1 (32-bit editions)
- affected 2013 Service Pack 1 (64-bit editions)
- affected 2016 (32-bit edition)
- affected 2016 (64-bit edition)
- affected 2016 Click-to-Run (C2R) for 32-bit editions
- affected 2016 Click-to-Run (C2R) for 64-bit editions
- affected Web Apps 2010 Service Pack 2
- affected Web Apps 2013 Service Pack 1
References
2
- 104996 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8378 (opens in a new tab)x_refsource_CONFIRMx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2018-20022 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2018-8378)Record last updated .