WireGuard Client 0.5.3 on Windows Vulnerability: LocalNet Attack Resulting in Traffic Blocking

CVE-2023-35838 · MEDIUM Severity

CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

The WireGuard client 0.5.3 on Windows insecurely configures the operating system and firewall such that traffic to a local network that uses non-RFC1918 IP addresses is blocked. This allows an adversary to trick the victim into blocking IP traffic to selected IP addresses and services even while the VPN is enabled. NOTE: the tunnelcrack.mathyvanhoef.com website uses this CVE ID to refer more generally to "LocalNet attack resulting in the blocking of traffic" rather than to only WireGuard.

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