CVE-2015-1671

Exp

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."

Published: 2015-05-13 Last update: 2026-04-22 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2015-1671 is rated Critical Active Threat (92.1/100): CVSS High severity, with high exploitation likelihood (EPSS 88.03%, 99th percentile). CISA KEV confirms active exploitation (added 2022-05-25) affecting Microsoft / Windows. Unauthenticated remote administrative access may be possible. EPSS rose +1.06% over the last day, indicating growing attacker interest. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2015-1671

Name: Microsoft Windows Remote Code Execution Vulnerability · CISA KEV detail

Exploit added: 2022-05-25

Action due: 2022-06-15

Required action: Apply updates per vendor instructions.

Exploit prediction scoring system (EPSS) score for CVE-2015-1671

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-01 86.97% 88.03% +1.06%
2 2026-04-23 85.93% 86.97% +1.04%
3 2026-02-07 — 85.93% —

Full EPSS history (26 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2015-1671

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0
9.3 2.0 HIGH
AV:N/AC:M/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.6 10.0 [email protected]

Weakness enumeration for CVE-2015-1671

Affected software / configurations for CVE-2015-1671

Vendor Product Version Raw CPE
microsoft .net_framework 3.0 cpe:2.3:a:microsoft:.net_framework:3.0:sp2:*:*:*:*:*:*
microsoft .net_framework 4.0 cpe:2.3:a:microsoft:.net_framework:4.0:-:*:*:*:*:*:*
microsoft .net_framework 4.5 cpe:2.3:a:microsoft:.net_framework:4.5:*:*:*:*:*:*:*
microsoft .net_framework 4.5.1 cpe:2.3:a:microsoft:.net_framework:4.5.1:*:*:*:*:*:*:*
microsoft .net_framework 4.5.2 cpe:2.3:a:microsoft:.net_framework:4.5.2:*:*:*:*:*:*:*
microsoft .net_framework 3.5.1 cpe:2.3:a:microsoft:.net_framework:3.5.1:*:*:*:*:*:*:*
microsoft .net_framework 3.5 cpe:2.3:a:microsoft:.net_framework:3.5:-:*:*:*:*:*:*
microsoft live_meeting 2007 cpe:2.3:a:microsoft:live_meeting:2007:*:*:*:*:*:*:*
microsoft lync 2010 cpe:2.3:a:microsoft:lync:2010:*:*:*:attendee:*:*:*
microsoft lync 2013 cpe:2.3:a:microsoft:lync:2013:sp1:*:*:*:*:*:*
microsoft silverlight 5.0 cpe:2.3:a:microsoft:silverlight:5.0:*:*:*:*:*:*:*

References for CVE-2015-1671

cvelogic Threat Intelligence