CVE-2017-11826
HighExploitedPublic exploitMicrosoft Office 2010, SharePoint Enterprise Server 2010, SharePoint Server 2010, Web Applications, Office Web Apps Server 2010 and 2013, Word Viewer, Word 2007, 2010, 2013 and 2016, Word Automation Services, and Office Online Server allow remote code execution when the software…
Published Oct 13, 2017 · Updated Apr 22, 2026
Key Facts
Patch immediately- CVE-2017-11826 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Office Compatibility Pack (Microsoft), Office Online Server (Microsoft), Office Web Apps Server (Microsoft) and 5 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 28, 2017. Public exploit code is available.
- EPSS estimates a 81% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.8
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
81%
Higher than 99.6% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2017-11826 brief as a PDF
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Description
Microsoft Office 2010, SharePoint Enterprise Server 2010, SharePoint Server 2010, Web Applications, Office Web Apps Server 2010 and 2013, Word Viewer, Word 2007, 2010, 2013 and 2016, Word Automation Services, and Office Online Server allow remote code execution when the software fails to properly handle objects in memory.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Mar 3, 2022 | Mar 24, 2022 | Not reported |
| Industry KEV feed | Sep 28, 2017 | Mar 24, 2022 | Not reported |
| CIRCL KEV | Mar 3, 2022 | Mar 24, 2022 | Not reported |
| ENISA EUVD | Mar 3, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
14 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Office Compatibility PackMicrosoft | See advisory | n/a |
| Office Online ServerMicrosoft | 2016 | n/a |
| Office Web Apps ServerMicrosoft | 2010-sp2, 2013-sp1 | n/a |
| Office Word ViewerMicrosoft | See advisory | n/a |
| Sharepoint Enterprise ServerMicrosoft | 2016 | n/a |
Timeline
Added to Industry KEV feed
Sep 28, 2017
Publicly disclosed
Oct 13, 2017
Added to CISA KEV
Mar 3, 2022
Added to CIRCL KEV
Mar 3, 2022
Added to ENISA EUVD
Mar 3, 2022
Last updated
Apr 22, 2026
Weakness Type
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
References
- advisoryhttps://securingtomorrow.mcafee.com/mcafee-labs/analyzing-microsoft-office-zero-day-exploit-cve-2017-11826-memory-corruption-vulnerability/
- advisory101219
- advisory1039541
- patchhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11826
- exploithttps://0patch.blogspot.com/2017/11/0patching-pretty-nasty-microsoft-word.html
FAQ
Common Questions.
Microsoft Office 2010, SharePoint Enterprise Server 2010, SharePoint Server 2010, Web Applications, Office Web Apps Server 2010 and 2013, Word Viewer, Word 2007, 2010, 2013 and 2016, Word Automation Services, and Office Online Server allow remote code execution when the software fails to properly handle objects in mem…
Affected: Office Compatibility Pack (Microsoft); Office Online Server (Microsoft) versions 2016; Office Web Apps Server (Microsoft) versions 2010-sp2, 2013-sp1, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 28, 2017.
Yes. It was added on Mar 3, 2022 with a federal remediation due date of Mar 24, 2022.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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