CVE catalog

CVE-2023-35838

UBUNTU-

[CVE catalog]

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.

Severity
Unknown
Published
Updated
Source
[NVD] · [CVE record]
EPSS
0.69% · Oct 27, 2026

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence
Original provider fields
{
  "package_releases": [],
  "fixed_versions": [],
  "distribution_packages": [
    {
      "name": "wireguard",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "16.04",
      "versions": [
        "1.0.20200513-1~16.04.1",
        "1.0.20200513-1~16.04.2"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2023-35838"
    },
    {
      "name": "wireguard",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "18.04",
      "versions": [
        "1.0.20200513-1~18.04.1",
        "1.0.20200513-1~18.04.2"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2023-35838"
    },
    {
      "name": "wireguard",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "20.04",
      "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": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2023-35838"
    },
    {
      "name": "wireguard",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "22.04",
      "versions": [
        "1.0.20210424-1ubuntu1",
        "1.0.20210914-1ubuntu1",
        "1.0.20210914-1ubuntu2"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2023-35838"
    },
    {
      "name": "wireguard",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "24.04",
      "versions": [
        "1.0.20210914-1ubuntu3",
        "1.0.20210914-1ubuntu4"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2023-35838"
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

Observed:

References

[FIRST EPSS] · [OSV Package Vulnerability Database]