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      <title>CVE-2021-21404 — Crash due to malformed relay protocol message</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2021-21404</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; syncthing&lt;/p&gt;
&lt;p&gt;Syncthing is a continuous file synchronization program. In Syncthing before version 1.15.0, the relay server `strelaysrv` can be caused to crash and exit by sending a relay message with a negative length field. Similarly, Syncthing itself can crash for the same reason if given a malformed message from a malicious relay server when attempting to join the relay. Relay joins are essentially random (from a subset of low latency relays) and Syncthing will by default restart when crashing, at which point it&amp;#39;s likely to pick another non-malicious relay. This flaw is fixed in version 1.15.0.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; syncthing&lt;/p&gt;
&lt;p&gt;Syncthing is a continuous file synchronization program. In Syncthing before version 1.15.0, the relay server `strelaysrv` can be caused to crash and exit by sending a relay message with a negative length field. Similarly, Syncthing itself can crash for the same reason if given a malformed message from a malicious relay server when attempting to join the relay. Relay joins are essentially random (from a subset of low latency relays) and Syncthing will by default restart when crashing, at which point it&amp;#39;s likely to pick another non-malicious relay. This flaw is fixed in version 1.15.0.&lt;/p&gt;</content:encoded>
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