Which products and versions are affected by CVE-2015-1671?

Affected: Live Meeting (Microsoft) versions 2007; Lync (Microsoft) versions 2010, 2013-sp1; .net Framework (Microsoft) versions 3.0-sp2, 3.5, 3.5.1, 4.0, 4.5, 4.5.1, 4.5.2, among others. The full list is in the CVE brief.

Is CVE-2015-1671 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 2, 2015 and is known to be used in ransomware campaigns.

Is CVE-2015-1671 in the CISA KEV catalog?

Yes. It was added on May 25, 2022 with a federal remediation due date of Jun 15, 2022.

Is there a public exploit for CVE-2015-1671?

Public exploit code is available.

Is there a fix for CVE-2015-1671?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2015-1671 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2015-1671

HighExploitedPublic exploit

Published May 13, 2015 · Updated Apr 22, 2026

Key Facts

Patch immediately

CVE-2015-1671 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Live Meeting (Microsoft), Lync (Microsoft), .net Framework (Microsoft) and 1 more product.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 2, 2015 and is known to be used in ransomware campaigns. Public exploit code is available.
EPSS estimates a 49% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

7.8

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

EPSS (30-day exploit likelihood)

49%

Higher than 98.8% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings, used by ransomware

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2015-1671 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

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."

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	May 25, 2022	Jun 15, 2022	Not reported
Industry KEV feed	Nov 2, 2015	Jun 15, 2022	Known
CIRCL KEV	May 25, 2022	Jun 15, 2022	Not reported
ENISA EUVD	May 25, 2022	n/a	Not reported

Required action: Apply updates per vendor instructions.

Affected Products

11 affected entries in total

Product	Affected versions	Fixed in
Live MeetingMicrosoft	2007	n/a
LyncMicrosoft	2010, 2013-sp1	n/a
.net FrameworkMicrosoft	3.0-sp2, 3.5, 3.5.1, 4.0, 4.5, 4.5.1, 4.5.2	n/a
SilverlightMicrosoft	5.0	n/a

Timeline

Publicly disclosed
May 13, 2015
Added to Industry KEV feed
Nov 2, 2015
Added to CISA KEV
May 25, 2022
Added to CIRCL KEV
May 25, 2022
Added to ENISA EUVD
May 25, 2022
Last updated
Apr 22, 2026

References

4 more references in the full CVE brief

FAQ

Common Questions.

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…
Affected: Live Meeting (Microsoft) versions 2007; Lync (Microsoft) versions 2010, 2013-sp1; .net Framework (Microsoft) versions 3.0-sp2, 3.5, 3.5.1, 4.0, 4.5, 4.5.1, 4.5.2, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 2, 2015 and is known to be used in ransomware campaigns.
Yes. It was added on May 25, 2022 with a federal remediation due date of Jun 15, 2022.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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