What is CVE-2017-8502?

CVE-2017-8502 is a high-severity vulnerability in Microsoft Excel, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.8/10. Published 2017-07-11.

How severe is CVE-2017-8502?

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

Buffer overflow in Microsoft Excel

CVE-2017-8502

Microsoft Office allows a remote code execution vulnerability due to the way that it handles objects in memory, aka "Microsoft Office Memory Corruption Vulnerability". This CVE ID is unique from CVE-2017-8501.

Vulnerability class: Buffer Overflow

Published 2017-07-11 · 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: 0.231 (97.7th percentile), scored 2026-10-04.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 97.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.231 · newest: 0.231 · change: 0.000

Affected products

Microsoft Excel — versions 2010, 2013, 2016
Microsoft Corporation Excel 2010 Sp2, 2013 Sp1, And 2016. — versions Microsoft Office

Weakness classification (CWE)

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

References

www.securitytracker.com/id/1038851 (VDB Entry, Third Party Advisory, vdb-entry)
portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8502 (Patch, Vendor Advisory)
www.securityfocus.com/bid/99442 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2017-8502?: CVE-2017-8502 is a high-severity vulnerability in Microsoft Excel, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.8/10. Published 2017-07-11.
How severe is CVE-2017-8502?: High severity. CVSS v3 base score is 7.8 out of 10.