What is CVE-2016-3357?

CVE-2016-3357 is a high-severity vulnerability in Microsoft Office, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.8/10. Published 2016-09-14.

How severe is CVE-2016-3357?

High severity. CVSS v3 base score is 7.8 out of 10.

Is CVE-2016-3357 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Microsoft Office

CVE-2016-3357

Microsoft Office 2007 SP3, Office 2010 SP2, Office 2013 SP1, Office 2013 RT SP1, Office 2016, Word for Mac 2011, Word 2016 for Mac, Word Viewer, Word Automation Services on SharePoint Server 2010 SP2, SharePoint Server 2013 SP1, Excel Automation Services on SharePoint Server 2013 SP1, Word Automation Services on SharePoint Server 2013 SP1, Office Web Apps 2010 SP2, and Office Web Apps Server 2013 SP1 allow remote attackers to execute arbitrary code via a crafted document, aka "Microsoft Office Memory Corruption Vulnerability."

Vulnerability class: Buffer Overflow

Published 2016-09-14 · last modified 2026-10-15.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.548 (99.0th percentile), scored 2026-10-18.

High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.548 · newest: 0.548 · change: 0.000

Affected products

Microsoft Office — versions 2007, 2010, 2013
Microsoft Office Web Apps — versions 2010
Microsoft Office Web Apps Server — versions 2013
Microsoft Sharepoint Foundation — versions 2010, 2013
Microsoft Word For Mac — versions 2011, 2016
Microsoft Word Viewer

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

www.securityfocus.com/bid/92786 (vdb-entry)
www.securitytracker.com/id/1036785 (vdb-entry)
www.exploit-db.com/exploits/40406/ (exploit)
docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-107 (vendor-advisory)

Frequently asked questions

What is CVE-2016-3357?: CVE-2016-3357 is a high-severity vulnerability in Microsoft Office, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.8/10. Published 2016-09-14.
How severe is CVE-2016-3357?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2016-3357 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.