What is CVE-2017-8557?

CVE-2017-8557 is a medium-severity vulnerability in Microsoft Windows 10, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 5.5/10. Published 2017-07-11.

How severe is CVE-2017-8557?

Medium severity. CVSS v3 base score is 5.5 out of 10.

XXE in Microsoft Windows 10

CVE-2017-8557

Windows System Information Console 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, 1703, and Windows Server 2016 allows an information disclosure vulnerability improperly parses XML input containing a reference to an external entity, aka "Windows System Information Console Information Disclosure Vulnerability".

Vulnerability class: XXE (XML External Entity)

Published 2017-07-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.015 (74.1th percentile), scored 2026-10-04.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Microsoft Windows 10 — versions 1511, 1607, 1703
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 Windows Server 2016
Microsoft Corporation Windows Server 2008 Sp2 And R2 Sp1, 7 8.1, 2012 Gold R2, Rt 10 Gold, 1511, 1607, 1703, 2016 — versions Microsoft Windows

Weakness classification (CWE)

CWE-611 — Improper Restriction of XML External Entity Reference (XXE)

References

www.securitytracker.com/id/1038855 (VDB Entry, Third Party Advisory, vdb-entry)
portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8557 (Patch, Vendor Advisory)
www.securityfocus.com/bid/99387 (VDB Entry, Third Party Advisory, vdb-entry)
www.securityfocus.com/bid/99398 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2017-8557?: CVE-2017-8557 is a medium-severity vulnerability in Microsoft Windows 10, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 5.5/10. Published 2017-07-11.
How severe is CVE-2017-8557?: Medium severity. CVSS v3 base score is 5.5 out of 10.