CVE-2010-3962
Published 2010-11-05 · Updated 2026-06-16 · Source secure@microsoft.com
Summary
CVE-2010-3962 is a high-severity (CVSS 8.1) vulnerability in Microsoft Internet Explorer. CISA added it to the Known Exploited Vulnerabilities catalog on October 6, 2025, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by October 27, 2025. CISA does not currently list it as used in ransomware campaigns. Microsoft has 390 vulnerabilities in the KEV catalog, 117 of them linked to ransomware.
All 390 known-exploited Microsoft vulnerabilities →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.
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA Known-Exploited Vulnerability
Product: Microsoft — Internet Explorer
Name: Microsoft Internet Explorer Uninitialized Memory Corruption Vulnerability
Date added: 2025-10-06 · Due: 2025-10-27
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
References
- http://blogs.technet.com/b/msrc/archive/2010/11/02/microsoft-releases-security-advisory-2458511.aspx
- http://secunia.com/advisories/42091
- http://www.exploit-db.com/exploits/15418
- http://www.exploit-db.com/exploits/15421
- http://www.kb.cert.org/vuls/id/899748
- http://www.microsoft.com/technet/security/advisory/2458511.mspx
- http://www.securityfocus.com/bid/44536
- http://www.securitytracker.com/id?1024676