High 7.8Known exploited (CISA KEV)Published May 13, 2015

CVE-2015-1671The Windows DirectWrite library, as used in Microsoft .NET Framework 3.0 SP2, 3.5, 3.5.1, 4, 4.5, 4.5.1, and 4.5.2; Office 2007 SP3 and 2010 SP2; Live Meeting 2007 Console; Lync 2010; Lync 2010 Atten…

Updated under an hour ago (2026-10-19 07:50 UTC)

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It affects microsoft .net_framework and 3 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since May 25, 2022; federal agencies had to remediate by Jun 15, 2022. Treat that date as your deadline.

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Exploited in the last 30 days

The Windows DirectWrite library, as used in Microsoft .NET Framework 3.0 SP2, 3.5, 3.5.1, 4, 4.5, 4.5.1, and 4.5.2; Office 2007 SP3 and 2010 SP2; Live Meeting 2007 Console; Lync 2010; Lync 2010 Attendee; Lync 2013 SP1; Lync Basic 2013 SP1; Silverlight 5 before 5.1.40416.00; and Silverlight 5 Developer Runtime before 5.1.40416.00, allows remote attackers to execute arbitrary code via a crafted TrueType font, aka "TrueType Font Parsing Vulnerability."

CVSS: 7.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Added to CISA KEV May 25, 2022; federal remediation due Jun 15, 2022Apply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 48.99% (percentile 99)
Assigned by: microsoft
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

microsoft .net_framework microsoft:.net_framework	3.0; 4.0; 3.0; 4.0; 4.5; 4.5.1; 4.5.2; 3.5.1; and 3 more ranges	NVD
microsoft live_meeting microsoft:live_meeting	2007	NVD
microsoft lync microsoft:lync	2010; 2013	NVD
microsoft silverlight microsoft:silverlight	5.0	NVD

References

https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-044vendor-advisory, x-refsource-ms, patch
http://www.securitytracker.com/id/1032281vdb-entry, x-refsource-sectrack, broken-link, third-party-advisory
http://www.securityfocus.com/bid/74490vdb-entry, x-refsource-bid, broken-link, third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2015-1671us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.