What’s Vulnerable › Vulnerabilities

CVE-2023-35838

• Severity: medium (CVSS 5.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-08-09 · updated 2026-06-17
• Weakness: CWE-610

Description

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.

Affected products

• Wireguard: 0.5.3

References

• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2023-0015
• https://tunnelcrack.mathyvanhoef.com/details.html
• https://wireguard.com
• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2023-0015
• https://tunnelcrack.mathyvanhoef.com/details.html
• https://wireguard.com

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