What is CVE-2017-8567?

CVE-2017-8567 is a high-severity vulnerability in Microsoft Excel For Mac, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.8/10. Published 2017-09-13.

How severe is CVE-2017-8567?

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

Buffer overflow in Microsoft Excel For Mac

CVE-2017-8567

A remote code execution vulnerability exists in Microsoft Excel for Mac 2011 when it fails to properly handle objects in memory, aka "Microsoft Office Remote Code Execution".

Vulnerability class: Buffer Overflow

Published 2017-09-13 · last modified 2026-06-17.

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: 0.203 (97.4th percentile), scored 2026-10-06.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.203 · newest: 0.203 · change: 0.000

Affected products

Microsoft Excel For Mac — versions 2011
Microsoft Corporation Office — versions Microsoft Excel for Mac 2011

Weakness classification (CWE)

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

References

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8567 (Patch, Vendor Advisory)
www.securitytracker.com/id/1039315 (VDB Entry, Third Party Advisory, vdb-entry)
www.securityfocus.com/bid/100719 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2017-8567?: CVE-2017-8567 is a high-severity vulnerability in Microsoft Excel For Mac, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.8/10. Published 2017-09-13.
How severe is CVE-2017-8567?: High severity. CVSS v3 base score is 7.8 out of 10.