CVE-2026-83855

7.5High

Published 13 Oct 2026 · NVD status: Awaiting Analysis · AI triage by gemini-3.8-flash

7.5High

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Impact: High impact on availability
Weakness: CWE-191

Impact

Remote, unauthenticated attackers can crash the Windows WLAN Service over the network, causing a denial of service. They do not need credentials or user interaction to trigger it.

Root cause

An integer underflow (wraparound) flaw in the Windows WLAN Service leads to a service crash when processing malformed network traffic.

Affected systems

Versions not listed — check the vendor advisory.

CVSS v3.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Fix & remediation

Install the Microsoft security update for this CVE from Windows Update or MSRC; if patching must wait, disable the WLAN AutoConfig service (WlanSvc) or turn off Wi-Fi interfaces where not required.

shell

$ Stop-Service -Name WlanSvc -Force; Set-Service -Name WlanSvc -StartupType Disabled

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

Integer underflow (wrap or wraparound) in Windows WLAN Service allows an unauthorized attacker to deny service over a network.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83855

Source: nvd.nist.gov/vuln/detail/CVE-2026-83855