{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "quincy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.13.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-200"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-12-27T18:12:47Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "A new decloaking technique for nearly all VPN implementations has been found, which allows attackers to inject entries into the routing tables of unsuspecting victims using DHCP option 121. This allows attackers to redirect traffic, which is supposed to be sent encrypted over the VPN, through the physical interface handling DHCP for the network the victim\u0027s computer is connected to, effectively bypassing the VPN connection.\n\n### Impact\nAll users are potentially affected, as this attack vector can be used against _any_ VPN implementation without mitigations in place.\n\n### Patches\nCurrently, there are no existing mitigations employed by Quincy.\n\n### Workarounds\nDisabling DHCP option 121 in the DHCP client is a potential workaround, as it prevents this kind of attack.\n\n### References\nhttps://www.leviathansecurity.com/blog/tunnelvision",
  "id": "GHSA-hqmp-g7ph-x543",
  "modified": "2025-05-19T20:43:55Z",
  "published": "2024-12-27T18:12:47Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/M0dEx/quincy/security/advisories/GHSA-hqmp-g7ph-x543"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-3661"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/M0dEx/quincy"
    },
    {
      "type": "WEB",
      "url": "https://www.leviathansecurity.com/blog/tunnelvision"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "TunnelVision - decloaking VPNs using DHCP"
}