How severe is CVE-2013-3918?

CVE-2013-3918 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2013-3918 being actively exploited?

Yes. CVE-2013-3918 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2025-10-06, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2013-3918?

CVE-2013-3918 primarily affects Microsoft Windows 7. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-3918?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2013-3918 have an EU (EUVD) identifier?

Yes. CVE-2013-3918 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2013-3850. It is also flagged as exploited in the EUVD (since 2025-10-06).

When was CVE-2013-3918 published?

CVE-2013-3918 was published on 2013-11-12 and last updated on 2026-06-16.

CVE-2013-3918

CVE-2013-3918 is a high-severity vulnerability in Microsoft Windows 7 with a CVSS 3.x base score of 8.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2025-10-06). The underlying weakness is classified as CWE-787.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.3
EPSS exploit prediction: 74% (99th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2025-10-06)
EU (EUVD) id: EUVD-2013-3850
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2025-10-06)
Weakness: CWE-787
Affected product: Microsoft Windows 7
Published: 2013-11-12
Last modified: 2026-06-16

Description

The InformationCardSigninHelper Class ActiveX control in icardie.dll in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT Gold and 8.1 allows remote attackers to execute arbitrary code or cause a denial of service (out-of-bounds write) via a crafted web page that is accessed by Internet Explorer, as exploited in the wild in November 2013, aka "InformationCardSigninHelper Vulnerability."

Frequently asked questions

What is CVE-2013-3918?: The InformationCardSigninHelper Class ActiveX control in icardie.dll in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT Gold and 8.1 allows remote attackers to execute arbitrary code or cause a denial of service (out-of-bounds write) via a crafted web page that is accessed by Internet Explorer, as exploited in the wild in November 2013, aka "InformationCardSigninHelper Vulnerability."
How severe is CVE-2013-3918?: CVE-2013-3918 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2013-3918 being actively exploited?: Yes. CVE-2013-3918 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2025-10-06, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2013-3918?: CVE-2013-3918 primarily affects Microsoft Windows 7. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-3918?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2013-3918 have an EU (EUVD) identifier?: Yes. CVE-2013-3918 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2013-3850. It is also flagged as exploited in the EUVD (since 2025-10-06).
When was CVE-2013-3918 published?: CVE-2013-3918 was published on 2013-11-12 and last updated on 2026-06-16.

References

Affected products (14)

cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_8:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_rt:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2003:-:sp2:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:itanium:*
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2008:sp2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_vista:-:sp2:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_xp:-:sp2:*:*:professional:*:x64:*
cpe:2.3:o:microsoft:windows_xp:-:sp3:*:*:*:*:*:*

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