CVEs / CVE-2013-3918

CVE-2013-3918: Microsoft Windows Out-of-Bounds Write Vulnerability

• Known exploited in the CISA KEV catalog since 6 Oct 2025
• high 8.8 CVSS 3.1 (NVD)
• EPSS 73.6% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
• Last changed at its sources 16 Jun 2026

Summary

Microsoft Windows contains an out-of-bounds write vulnerability in the InformationCardSigninHelper Class ActiveX control, icardie.dll. An attacker could exploit the vulnerability by constructing a specially crafted webpage. When a user views the webpage, the vulnerability could allow remote code execution. An attacker who successfully exploited this vulnerability could gain the same user rights as the current user. The impacted product could be end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue product utilization.

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."

Affected and fixed versions

Exploitation

Severity

References

• CVE-2013-3918 on NVD
• CVE-2013-3918 in the CISA KEV catalog
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2013/ms13-090 (cited by CISA)
• http://blogs.technet.com/b/msrc/archive/2013/11/11/activex-control-issue-being-addressed-in-update-tuesday.aspx Third Party Advisory
• http://www.darkreading.com/vulnerability/new-ie-vulnerability-found-in-the-wild-s/240163814/ Broken Link
• http://www.fireeye.com/blog/technical/2013/11/new-ie-zero-day-found-in-watering-hole-attack.html Third Party Advisory
• http://www.us-cert.gov/ncas/alerts/TA13-317A Third Party Advisory, US Government Resource
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2013/ms13-090 Patch, Vendor Advisory
• https://isc.sans.edu/forums/diary/16985 Third Party Advisory
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19089 Broken Link, Third Party Advisory
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2013-3918 US Government Resource
• https://www.microsoft.com/en-us/msrc/blog/2013/11/technical-details-of-the-targeted-attack-using-ie-vulnerability-cve-2013-3918/ Vendor Advisory