Vulnerability · Published Aug 9, 2023 · Assigned by mitre
CVE-2023-35838
Medium 5.7
In plain English
A medium-severity security flaw in the wireguard package (PyPI). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | wireguard | no fix listed | PYSEC-2023-321 |
| Ubuntu:22.04:LTS | wireguard | no fix listed | UBUNTU-CVE-2023-35838 |
| Ubuntu:24.04:LTS | wireguard | no fix listed | UBUNTU-CVE-2023-35838 |