Microsoft Windows Out-of-Bounds Write Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2025-10-06
• EPSS: 74% chance of exploitation in the next 30 days (higher than 99% of CVEs)

[ Description ]Official 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."

CISA: 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.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 27 Oct 2025): Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

• Patch on docs.microsoft.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD

[ References ]References

• blogs.technet.com/b/msrc/archive/2013/11/11/activex-control-issue-being-addressed-in-up…Third Party Advisory
• www.darkreading.com/vulnerability/new-ie-vulnerability-found-in-the-wild-s/240163814Broken Link
• www.fireeye.com/blog/technical/2013/11/new-ie-zero-day-found-in-watering-hole-attack.htmlThird Party Advisory
• www.us-cert.gov/ncas/alerts/TA13-317AThird Party AdvisoryUS Government Resource
• docs.microsoft.com/en-us/security-updates/securitybulletins/2013/ms13-090PatchVendor Advisory
• isc.sans.edu/forums/diary/16985Third Party Advisory
• oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19089Broken LinkThird Party Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource
• www.microsoft.com/en-us/msrc/blog/2013/11/technical-details-of-the-targeted-attack-usin…Vendor Advisory