WireGuard: The WireGuard client 0.5.3 on Windows insecurely configures the operating system and firewall such that…
CVE-2023-35838 is fixed in WireGuard on 1 platform by WireGuard 0.6.1 (version 0.6.1), released April 10, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| WireGuard | 0.6.1 | WireGuard 0.6.1 | Apr 10, 2026 |
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