{"id":"UBUNTU-CVE-2023-35838","details":"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.","modified":"2026-01-20T17:36:51.506827Z","published":"2023-08-09T23:15:00Z","upstream":["CVE-2023-35838"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-35838"},{"type":"REPORT","url":"https://tunnelcrack.mathyvanhoef.com/details.html"},{"type":"REPORT","url":"https://papers.mathyvanhoef.com/usenix2023-tunnelcrack.pdf"},{"type":"REPORT","url":"https://openvpn.net/security-advisory/statement-regarding-tunnelcrack-vulnerabilities/"},{"type":"REPORT","url":"https://www.softether.org/9-about/News/905-TunnelCrack"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-35838"},{"type":"REPORT","url":"https://security.paloaltonetworks.com/PAN-SA-2023-0004"}],"affected":[{"package":{"name":"wireguard","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/wireguard@1.0.20200513-1~16.04.2?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.20200513-1~16.04.1","1.0.20200513-1~16.04.2"],"ecosystem_specific":{"binaries":[{"binary_name":"wireguard","binary_version":"1.0.20200513-1~16.04.2"},{"binary_name":"wireguard-tools","binary_version":"1.0.20200513-1~16.04.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-35838.json"}},{"package":{"name":"wireguard","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/wireguard@1.0.20200513-1~18.04.2?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.20200513-1~18.04.1","1.0.20200513-1~18.04.2"],"ecosystem_specific":{"binaries":[{"binary_name":"wireguard","binary_version":"1.0.20200513-1~18.04.2"},{"binary_name":"wireguard-tools","binary_version":"1.0.20200513-1~18.04.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-35838.json"}},{"package":{"name":"wireguard","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/wireguard@1.0.20200513-1~20.04.2?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0.20190913-1ubuntu1","0.0.20191212-1ubuntu1","0.0.20191219-1ubuntu1","1.0.20200102-1ubuntu1","1.0.20200121-1ubuntu1","1.0.20200121-2ubuntu1","1.0.20200206-1ubuntu1","1.0.20200206-2ubuntu1","1.0.20200319-1ubuntu1","1.0.20200513-1~20.04.1","1.0.20200513-1~20.04.2"],"ecosystem_specific":{"binaries":[{"binary_name":"wireguard","binary_version":"1.0.20200513-1~20.04.2"},{"binary_version":"1.0.20200513-1~20.04.2","binary_name":"wireguard-tools"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-35838.json"}},{"package":{"name":"wireguard","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/wireguard@1.0.20210914-1ubuntu2?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.20210424-1ubuntu1","1.0.20210914-1ubuntu1","1.0.20210914-1ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"wireguard","binary_version":"1.0.20210914-1ubuntu2"},{"binary_name":"wireguard-tools","binary_version":"1.0.20210914-1ubuntu2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-35838.json"}},{"package":{"name":"wireguard","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/wireguard@1.0.20210914-1ubuntu4?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.20210914-1ubuntu3","1.0.20210914-1ubuntu4"],"ecosystem_specific":{"binaries":[{"binary_version":"1.0.20210914-1ubuntu4","binary_name":"wireguard"},{"binary_name":"wireguard-tools","binary_version":"1.0.20210914-1ubuntu4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-35838.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}