PatchSiren cyber security CVE debrief
CVE-2010-3962 Microsoft CVE debrief
CVE-2010-3962 is a Microsoft Internet Explorer uninitialized memory corruption vulnerability that CISA lists in its Known Exploited Vulnerabilities catalog. That KEV listing makes this a defensive priority for any environment that still relies on Internet Explorer, especially where legacy systems or embedded dependencies make removal difficult. The supplied corpus does not provide a CVSS score or detailed affected-version scope, so remediation planning should lean on the KEV status and the vendor’s mitigation guidance.
- Vendor
- Microsoft
- Product
- Internet Explorer
- CVSS
- Unknown
- CISA KEV
- Listed
- Original CVE published
- 2025-10-06
- Original CVE updated
- 2025-10-06
- Advisory published
- 2025-10-06
- Advisory updated
- 2025-10-06
Who should care
Security and IT teams responsible for legacy Microsoft Internet Explorer deployments, Windows environments that still allow IE usage, and asset owners who need to confirm whether any internal applications, kiosks, or managed desktops still depend on the browser.
Technical summary
The issue is described as an uninitialized memory corruption vulnerability in Microsoft Internet Explorer. CISA’s KEV catalog identifies it as known to be exploited, which indicates it should be treated as an active-risk issue rather than a routine patch item. The supplied records do not include exploit details, affected versions, or a CVSS rating, so the safest interpretation is to prioritize mitigation on any systems where Internet Explorer remains present or enabled.
Defensive priority
High to urgent for any exposed or still-supported environment; immediate attention is warranted because CISA has classified it as known exploited and set a remediation due date in the KEV catalog.
Recommended defensive actions
- Check whether any endpoints, servers, VDI images, or embedded workflows still rely on Internet Explorer.
- Apply vendor-recommended mitigations referenced by CISA KEV as soon as possible.
- If mitigations are unavailable or Internet Explorer is no longer required, discontinue use and remove exposure where feasible.
- Validate whether security controls, browser restrictions, or application compatibility settings still permit IE execution.
- Track remediation against the CISA KEV due date and confirm closure with asset owners.
Evidence notes
Supported facts in the supplied corpus: CISA’s Known Exploited Vulnerabilities entry names Microsoft Internet Explorer, describes the issue as an uninitialized memory corruption vulnerability, marks it as known exploited, and sets dateAdded to 2025-10-06 with dueDate 2025-10-27. The provided source item also states the required action is to apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. The corpus includes official CVE and NVD links, but it does not include a CVSS score or a detailed affected-version breakdown.
Official resources
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CVE-2010-3962 CVE record
CVE.org
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CVE-2010-3962 NVD detail
NVD
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CISA Known Exploited Vulnerabilities catalog
CISA - Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
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Source item URL
cisa_kev
This debrief is based only on the supplied CISA KEV feed item and the official CVE/NVD links included in the corpus. Timing context reflects the supplied KEV publication and due-date fields; it does not imply the original vulnerability was,