How severe is CVE-2015-1671?

CVE-2015-1671 has a CVSS score of 7.8/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2015-1671?

Affected package information for CVE-2015-1671 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2015-1671?

No fixed version has been published for CVE-2015-1671 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

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

Yes. There are 2 known exploit references for CVE-2015-1671, including 2 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2015-1671?

CVE-2015-1671 has an EPSS (Exploit Prediction Scoring System) score of 88.0%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2015-1671 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2015-1671 (Microsoft Windows Remote Code Execution Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2022-05-25. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-06-15. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

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

CVE-2015-1671 affects microsoft .net framework (7 versions, e.g. 3.0, 3.5, 3.5.1…); microsoft live meeting (1 version, e.g. 2007); microsoft lync (2 versions, e.g. 2010, 2013); microsoft silverlight (1 version, e.g. 5.0). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2015-1671 published, and has it been updated?

CVE-2015-1671 was published on May 13, 2015 and was last updated on April 22, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2022-05-25 — agencies required to remediate by 2022-06-15

CVE-2015-1671

HIGH

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;…

Published

May 13, 2015

Updated

Apr 22, 2026

Affected

0 pkgs

Patched

None yet

Exploits

2 known

EPSS Exploitation Probability

via FIRST.org ↗

88.0%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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."

Affected Products

4 products · 15 configurations

Application

.net frameworkmicrosoft

7 versions

3.03.53.5.14.04.54.5.14.5.2

Application

live meetingmicrosoft

1 version

2007

Application

lyncmicrosoft

2 versions

20102013

Application

silverlightmicrosoft

1 version

5.0

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

The Windows DirectWrite library, as used in Microsoft .NET Framework 3.0…

cisa.govCISAMay 2022

The Windows DirectWrite library, as used in Microsoft .NET Framework 3.0…

malware289.rssing.comAPIJul 2015

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2015-1671 in your stack?

O3 detects CVE-2015-1671 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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