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HIGH · CVSS 7.8 CISA Known Exploited Vulnerability

CVE-2015-1671

Microsoft Windows Remote Code Execution Vulnerability

Microsoft Windows

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
EPSS
48.8%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
13 May 2015
NVD

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 25 May 2022. US federal agencies were required to remediate it by 15 June 2022.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 48.8%, which is higher than 98.9% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Frequently asked questions

Is CVE-2015-1671 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2015-1671.

What does CVE-2015-1671 affect?

CVE-2015-1671 affects Microsoft Windows. 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."

How severe is CVE-2015-1671?

CVE-2015-1671 is rated HIGH with a CVSS base score of 7.8. EPSS puts the probability of exploitation in the next 30 days at 48.8%, higher than 98.9% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 15 June 2022.

How should organisations respond to CVE-2015-1671?

Apply the vendor patch for Microsoft Windows as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.