CVE-2017-11826 — Microsoft Office Remote Code Execution Vulnerability

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

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
Microsoft Corporation	Microsoft Office	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, Office Online Server.

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2022-03-03. Ransomware use: Unknown.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2017-10-13T13:00:00.000Z
• Last modified: 2025-10-21T23:55:31.281Z
• Added to CISA KEV: 2022-03-03
• BOD 22-01 due: 2022-03-24

09References

• portal.msrc.microsoft.com — https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-1182…
• 0patch.blogspot.com — https://0patch.blogspot.com/2017/11/0patching-pretty-nasty-microsoft-word.html
• www.securityfocus.com — http://www.securityfocus.com/bid/101219
• www.tarlogic.com — https://www.tarlogic.com/en/blog/exploiting-word-cve-2017-11826/
• www.securitytracker.com — http://www.securitytracker.com/id/1039541
• securingtomorrow.mcafee.com — https://securingtomorrow.mcafee.com/mcafee-labs/analyzing-microsoft-office-zero-…