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    <lastBuildDate>Wed, 07 Oct 2026 08:44:07 +0000</lastBuildDate>
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      <title>CVE-2026-25791 — Sliver has a DNS C2 OTP Bypass Allows Unauthenticated Session Flooding and Denial of Service</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-25791</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; BishopFox sliver&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; BishopFox sliver&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;</content:encoded>
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