Exploited vulnerability · CISA KEV

Is CVE-2010-3962 exploited? Yes: in CISA KEV since 6 Oct 2025

Gociux · Microsoft Internet Explorer · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2010-3962, Microsoft Internet Explorer Uninitialized Memory Corruption Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 6 Oct 2025, 5449 days after it was published. It affects Microsoft Internet Explorer. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

What it is

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.

What to do

1. Check whether you run it. Look for Internet Explorer in your asset inventory, including appliances and cloud images. Stack check lists every exploited Microsoft CVE at once.
2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 5 Nov 2010.
4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

Other exploited CVEs in Internet Explorer

• CVE-2010-0249: Microsoft Internet Explorer Use-After-Free Vulnerability (20 May 2026)
• CVE-2010-0806: Microsoft Internet Explorer Use-After-Free Vulnerability (20 May 2026)
• CVE-2013-3893: Microsoft Internet Explorer Resource Management Errors Vulnerability (12 Aug 2025)
• CVE-2012-4792: Microsoft Internet Explorer Use-After-Free Vulnerability (23 Jul 2024)
• CVE-2013-3163: Microsoft Internet Explorer Memory Corruption Vulnerability (30 Mar 2023)
• CVE-2012-4969: Microsoft Internet Explorer Use-After-Free Vulnerability (8 Jun 2022)

References

• learn.microsoft.com/en-us/security-updates/SecurityAdvisories/2010/2458511
• nvd.nist.gov/vuln/detail/CVE-2010-3962

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in October 2025 · Microsoft scorecard · act-now radar.