Windows Server 2008 SP2 and R2 SP1, and Windows 7 SP1 allow an attacker to execute code remotely on a target system when the Windows font l…

published 2017-08-08 9y ago modified 2026-06-17 4mo ago also EUVD-2017-17638

cvss: 8.8; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 19.8%; EPSS 19.8% chance of exploitation in 30 days, percentile 97%
public exploits: 0; none known

Windows Server 2008 SP2 and R2 SP1, and Windows 7 SP1 allow an attacker to execute code remotely on a target system when the Windows font library fails to properly handle specially crafted embedded fonts, aka "Express Compressed Fonts Remote Code Execution Vulnerability."

Patch / fix

links 1

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8691 advisory

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Exploit prediction

19.77% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.0	8.8	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	9.3	AV:N/AC:M/Au:N/C:C/I:C/A:C

Affected products

Microsoft Corporation Windows Kernel-Mode Drivers

Classification

Weakness

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

References

portal.msrc.microsoft.com /en-US/security-guidance/advisory/CVE-2017-8691
patch, vendor-advisory
securityfocus.com /bid/100090
vdb-entry, third-party-advisory
fortiguard.com /zeroday/FG-VD-17-142
securitytracker.com /id/1039096
vdb-entry, third-party-advisory

Sources

CVE List CVE-2017-8691
NVD CVE-2017-8691

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