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      <title>GHSA-3qp7-7mw8-wx86 — Netty has an IPv6 Subnet Filter Bypass via Incorrect Comparator Masking</title>
      <link>https://vulnerability.circl.lu/vuln/ghsa-3qp7-7mw8-wx86</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Maven: io.netty:netty-handler&lt;/p&gt;
&lt;p&gt;### Summary
An attacker can bypass IPv6 subnet rules due to an incorrect masking operation in IpSubnetFilterRule.compareTo(). Valid public IP addresses can bypass the restrictions.&lt;/p&gt;
&lt;p&gt;### Details
`io.netty.handler.ipfilter.IpSubnetFilterRule#compareTo(java.net.InetSocketAddress)` method performs a bitwise AND between the incoming IP address and the configured networkAddress, instead of the subnetMask.&lt;/p&gt;
&lt;p&gt;### Impact
Access Control Bypass. Attacker can bypass IpSubnetFilter IPv6 access controls.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Maven: io.netty:netty-handler&lt;/p&gt;
&lt;p&gt;### Summary
An attacker can bypass IPv6 subnet rules due to an incorrect masking operation in IpSubnetFilterRule.compareTo(). Valid public IP addresses can bypass the restrictions.&lt;/p&gt;
&lt;p&gt;### Details
`io.netty.handler.ipfilter.IpSubnetFilterRule#compareTo(java.net.InetSocketAddress)` method performs a bitwise AND between the incoming IP address and the configured networkAddress, instead of the subnetMask.&lt;/p&gt;
&lt;p&gt;### Impact
Access Control Bypass. Attacker can bypass IpSubnetFilter IPv6 access controls.&lt;/p&gt;</content:encoded>
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