Use After Free in Microsoft Windows 10 1607
CVE-2026-78523
Use after free in Windows DNS allows an unauthorized attacker to deny service over a network.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.010 (62.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 62nd percentile — 62.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
- Microsoft Windows 10 1607
- Microsoft Windows 10 1809
- Microsoft Windows 10 Version 1607
- Microsoft Windows 10 Version 1809
- Microsoft Windows Server 2012
- Microsoft Windows Server 2012 — versions r2
- Microsoft Windows Server 2012 R2
- Microsoft Windows Server 2012 R2 (Server Core Installation)
- Microsoft Windows Server 2012 (Server Core Installation)
- Microsoft Windows Server 2016
Weakness classification (CWE)
References
- Windows DNS Server Denial of Service Vulnerability (vendor-advisory, Patch, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-78523?
- CVE-2026-78523 is a medium-severity vulnerability in Microsoft Windows 10 1607, classified under Use After Free. CVSS score: 5.9/10. Published 2026-09-08.
- How severe is CVE-2026-78523?
- Medium severity. CVSS v3 base score is 5.9 out of 10.