Out-of-bounds Read in Microsoft Windows 10 Version 21h2

CVE-2026-70579

Out-of-bounds read in Windows Mobile Broadband allows an unauthorized attacker to disclose information over a network.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-70579?
CVE-2026-70579 is a high-severity vulnerability in Microsoft Windows 10 Version 21h2, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2026-09-08.
How severe is CVE-2026-70579?
High severity. CVSS v3 base score is 7.5 out of 10.