Is CVE-2010-3962 being actively exploited?

Yes. CVE-2010-3962 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added on October 6, 2025.

What is the CVSS score for CVE-2010-3962?

CVE-2010-3962 has a CVSS 3.1 base score of 8.1 (HIGH).

CVE-2010-3962

HIGH · CVSS 8.1CISA KEV: actively exploitedEPSS 96.8%EU EUVD: exploited

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.

Key facts

CVSS score: 8.1 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
EPSS score: 96.8% (100th percentile)
In CISA KEV: Yes, added October 6, 2025
In EU EUVD: Yes (EUVD-2010-3939)
Published: November 5, 2010
NVD last modified: June 16, 2026
Status: Analyzed

CISA Known Exploited Vulnerability

Microsoft Internet Explorer Uninitialized Memory Corruption Vulnerability

Added to the KEV catalog on October 6, 2025; federal remediation due October 27, 2025.

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2010-3939 in the EU Vulnerability Database. ENISA flags it as known exploited. Last updated in EUVD on October 22, 2025.

View on the EU Vulnerability Database

Affected products

microsoft / internet explorer
microsoft / internet explorer
microsoft / internet explorer
microsoft / windows 7
microsoft / windows server 2003
microsoft / windows server 2008
microsoft / windows server 2008
microsoft / windows server 2008
microsoft / windows vista
microsoft / windows vista
microsoft / windows xp
microsoft / windows xp
microsoft / windows xp

References

http://blogs.technet.com/b/msrc/archive/2010/11/02/microsoft-releases-security-advisory-2458511.aspx(Vendor Advisory)
http://secunia.com/advisories/42091(Broken Link, Vendor Advisory)
http://www.exploit-db.com/exploits/15418(Third Party Advisory, VDB Entry)
http://www.exploit-db.com/exploits/15421(Third Party Advisory, VDB Entry)
http://www.kb.cert.org/vuls/id/899748(Third Party Advisory, US Government Resource)
http://www.microsoft.com/technet/security/advisory/2458511.mspx(Patch, Vendor Advisory)
http://www.securityfocus.com/bid/44536(Broken Link, Third Party Advisory, VDB Entry)
http://www.securitytracker.com/id?1024676(Broken Link, Third Party Advisory, VDB Entry)
http://www.symantec.com/connect/blogs/new-ie-0-day-used-targeted-attacks(Not Applicable)
http://www.us-cert.gov/cas/techalerts/TA10-348A.html(Third Party Advisory, US Government Resource)
http://www.vupen.com/english/advisories/2010/2880(Broken Link, Vendor Advisory)
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2010/ms10-090(Patch, Vendor Advisory)
https://exchange.xforce.ibmcloud.com/vulnerabilities/62962(Third Party Advisory, VDB Entry)
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12279(Tool Signature)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2010-3962(US Government Resource)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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