Exploited vulnerability · CISA KEV
Is CVE-2017-11882 exploited? Yes: in CISA KEV since 3 Nov 2021
Gociux · Microsoft Office · data: CISA KEV, CVE record, FIRST EPSS
Yes. CVE-2017-11882, Microsoft Office Memory Corruption Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 1449 days after it was published. It is known to be used in ransomware campaigns. It affects Microsoft Office. If you run it, CISA's required action is: Apply updates per vendor instructions.
exploitedYesCISA KEV · 3 Nov 2021
ransomwareKnownused in campaigns
EPSStop 1%among the most likely CVEs to be exploited
severity7.8CVSS 3.1 · high
US federal due3 May 2022BOD 22-01 deadline
What it is
Microsoft Office contains a memory corruption vulnerability that allows remote code execution in the context of the current user.
| Vendor | Microsoft (391 exploited CVEs in KEV) |
| Product | Office |
| Vulnerability | Microsoft Office Memory Corruption Vulnerability |
| Weakness | CWE-119 |
| Published | 15 Nov 2017 |
| Added to KEV | 3 Nov 2021 |
| Reported by (CNA) | microsoft |
What to do
- Check whether you run it. Look for Office in your asset inventory, including appliances and cloud images. Stack check lists every exploited Microsoft CVE at once.
- Apply the fix. Apply updates per vendor instructions.
- If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 15 Nov 2017.
- Get told next time. Email alerts when CISA adds a CVE for Microsoft.
Other exploited CVEs in Office
- CVE-2026-124194: Microsoft Office Outlook Missing User Interaction for Potentially Unsafe Action Vulnerability (10 Nov 2026)
- CVE-2009-0238: Microsoft Office Remote Code Execution (14 Apr 2026)
- CVE-2026-21514: Microsoft Office Word Reliance on Untrusted Inputs in a Security Decision Vulnerability (10 Feb 2026)
- CVE-2026-21509: Microsoft Office Security Feature Bypass Vulnerability (26 Jan 2026)
- CVE-2009-0556: Microsoft Office PowerPoint Code Injection Vulnerability (7 Jan 2026)
- CVE-2007-0671: Microsoft Office Excel Remote Code Execution Vulnerability (12 Aug 2025)
References
Questions
Is CVE-2017-11882 being exploited?
Yes. CISA added CVE-2017-11882 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.
Is CVE-2017-11882 used in ransomware attacks?
Yes, CISA lists it as known to be used in ransomware campaigns.
How do I fix CVE-2017-11882?
Apply updates per vendor instructions. Check Microsoft's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Office and watch it for signs of compromise.
Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in November 2021 · Microsoft scorecard · act-now radar.
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