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PatchSiren cyber security CVE debrief

CVE-2026-70579 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-09-08T17:17:00.120Z and has not been modified since then. The NVD entry is currently unclassified. This high-severity vulnerability in Windows Mobile Broadband allows unauthorized information disclosure over a network. Defenders should assess exposure, especially in Windows 10 and Windows 11 deployments with Mobile Broadband configurations, and prioritize patching. The vulnerability is an out-of-bounds read issue. Microsoft's advisory provides details on affected versions and patches.

Vendor
Microsoft
Product
Windows 10 Version 21H2
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-10-08
Advisory published
2026-09-08
Advisory updated
2026-10-08

Who should care

Defenders responsible for Windows 10 and Windows 11 deployments, especially those with Mobile Broadband configurations, should assess exposure and prioritize patching.

Why it matters

CVE-2026-70579 is a high-severity vulnerability in Windows Mobile Broadband that allows unauthorized information disclosure. Defenders should prioritize verifying exposure and applying patches.

  • Verify exposure in Windows 10 and Windows 11 deployments with Mobile Broadband configurations
  • Apply patches from Microsoft as available
  • Monitor network traffic for unauthorized disclosure

Technical summary

CVE-2026-70579 is an out-of-bounds read vulnerability in Windows Mobile Broadband that allows unauthorized information disclosure over a network. Affected versions include Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 23H2, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, and Windows 11 version 26H1.

Defensive priority

Defenders should prioritize verifying exposure in Windows 10 and Windows 11 deployments, especially those with Mobile Broadband configurations, and apply patches from Microsoft as available.

Recommended defensive actions

  • Verify exposure in Windows 10 and Windows 11 deployments with Mobile Broadband configurations
  • Apply patches from Microsoft as available
  • Monitor network traffic for unauthorized disclosure

Evidence notes

The CVE record and NVD entry provide details on the vulnerability but do not specify exploitation or impact. Microsoft's advisory is available but requires verification of affected versions and patches.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-70579 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-70579

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

  • CVE-2026-70579 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-70579

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

Supplemental references

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.