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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.

Sources and references

Verified primary and authoritative sources

  • CVE-2010-3962 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2010-3962

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2010-3962 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2010-3962

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.