What is CVE-2017-8528?

CVE-2017-8528 is a high-severity vulnerability in Microsoft Office, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2017-06-15.

How severe is CVE-2017-8528?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2017-8528 known to be exploited?

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

Buffer overflow in Microsoft Office

CVE-2017-8528

Uniscribe in Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, Windows Server 2016, Microsoft Office 2007 SP3, and Microsoft Office 2010 SP2 allows a remote code execution vulnerability due to the way it handles objects in memory, aka "Windows Uniscribe Remote Code Execution Vulnerability". This CVE ID is unique from CVE-2017-0283.

Vulnerability class: Buffer Overflow

Published 2017-06-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.199 (97.4th percentile), scored 2026-10-04.

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: 0.199 · newest: 0.199 · change: 0.000

Affected products

Microsoft Office — versions 2007, 2010
Microsoft Windows 7
Microsoft Windows 8.1
Microsoft Windows Rt 8.1
Microsoft Windows Server 2008 — versions r2
Microsoft Windows Server 2012 — versions r2
Microsoft Corporation Uniscribe — versions Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, Windows Server 2016, Microsoft Office 2007 SP3, and Microsoft Office 2010 SP2.

Weakness classification (CWE)

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

Public proof-of-concept exploits

References

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8528 (Patch, Vendor Advisory)
www.securityfocus.com/bid/98949 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2017-8528?: CVE-2017-8528 is a high-severity vulnerability in Microsoft Office, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2017-06-15.
How severe is CVE-2017-8528?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2017-8528 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.