Microsoft Internet Explorer Uninitialized Memory Corruption Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2025-10-06
• EPSS: 97% chance of exploitation in the next 30 days (higher than 100% of CVEs)

[ Description ]Official description

Use-after-free vulnerability in Microsoft Internet Explorer 6, 7, and 8 allows remote attackers to execute arbitrary code via vectors related to Cascading Style Sheets (CSS) token sequences and the clip attribute, aka an "invalid flag reference" issue or "Uninitialized Memory Corruption Vulnerability," as exploited in the wild in November 2010.

CISA: Microsoft Internet Explorer contains an uninitialized memory corruption vulnerability that could allow for remote code execution. 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 microsoft.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
• Patch on docs.microsoft.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD

[ References ]References

• blogs.technet.com/b/msrc/archive/2010/11/02/microsoft-releases-security-advisory-245851…Vendor Advisory
• secunia.com/advisories/42091Broken LinkVendor Advisory
• www.exploit-db.com/exploits/15418Third Party AdvisoryVDB Entry
• www.exploit-db.com/exploits/15421Third Party AdvisoryVDB Entry
• www.kb.cert.org/vuls/id/899748Third Party AdvisoryUS Government Resource
• www.microsoft.com/technet/security/advisory/2458511.mspxPatchVendor Advisory
• www.securityfocus.com/bid/44536Broken LinkThird Party AdvisoryVDB Entry
• www.securitytracker.com/idBroken LinkThird Party AdvisoryVDB Entry
• www.symantec.com/connect/blogs/new-ie-0-day-used-targeted-attacksNot Applicable
• www.us-cert.gov/cas/techalerts/TA10-348A.htmlThird Party AdvisoryUS Government Resource
• www.vupen.com/english/advisories/2010/2880Broken LinkVendor Advisory
• docs.microsoft.com/en-us/security-updates/securitybulletins/2010/ms10-090PatchVendor Advisory
• exchange.xforce.ibmcloud.com/vulnerabilities/62962Third Party AdvisoryVDB Entry
• oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12279Tool Signature
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource