Sliver has a DNS C2 OTP Bypass Allows Unauthenticated Session Flooding and Denial of Service_CVE-2026-25791

{
    "lastseen": "",
    "description": "Sliver is a command and control framework that uses a custom Wireguard netstack. Prior to 1.7.0, the DNS C2 listener accepts unauthenticated TOTP bootstrap messages and allocates server-side DNS sessions without validating OTP values, even when EnforceOTP is enabled. Because sessions are stored without a cleanup/expiry path in this flow, an unauthenticated remote actor can repeatedly create sessions and drive memory exhaustion. This vulnerability is fixed in 1.7.0.",
    "published": "2026-02-09T20:34:31.144Z",
    "modified": "2026-02-09T20:34:31.144Z",
    "type": "cve",
    "title": "Sliver has a DNS C2 OTP Bypass Allows Unauthenticated Session Flooding and Denial of Service",
    "source": "GitHub_M",
    "references": "https://github.com/BishopFox/sliver/security/advisories/GHSA-wxrw-gvg8-fqjp\nhttps://github.com/BishopFox/sliver/releases/tag/v1.7.0",
    "id": "CVE-2026-25791",
    "bulletinFamily": "",
    "cwe": [
        "CWE-306",
        "CWE-400"
    ],
    "cvelist": null,
    "sourceData": "BishopFox sliver < 1.7.0",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
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    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "sliver",
    "version": "< 1.7.0",
    "vendor": "BishopFox",
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    "ai_score": 0
}