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    <lastBuildDate>Wed, 07 Oct 2026 07:17:27 +0000</lastBuildDate>
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      <title>CVE-2026-57023 — Junos OS: MX with SPC3, SRX Series: A specifically malformed TCP packet causes a flowd crash</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-57023</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Juniper Networks Junos OS&lt;/p&gt;
&lt;p&gt;An Improper Validation of Specified Quantity in Input vulnerability in the TCP proxy plugin of Juniper Networks Junos OS on MX Series with SPC3, and SRX Series allows an unauthenticated, network-based attacker to cause a complete Denial of Service (DoS).&lt;/p&gt;
&lt;p&gt;When TCP proxy is engaged in a flow session, to support ALGs, Advanced Anti-Malware, ICAP or UTM, a TCP packet with specifically malformed TCP header will cause flow processing daemon (flowd) to crash and restart. This causes a complete service outage until the system has automatically recovered.&lt;/p&gt;
&lt;p&gt;This issue affects Junos OS on MX with SPC3, and SRX Series:&lt;/p&gt;
&lt;p&gt;*  23.4 versions before 23.4R2-S7, 
  *  24.2 versions before 24.2R2-S4, 
  *  24.4 versions before 24.4R2-S3,
  *  25.2 versions before 25.2R2.&lt;/p&gt;
&lt;p&gt;This issue does not affect releases before 23.4R1.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Juniper Networks Junos OS&lt;/p&gt;
&lt;p&gt;An Improper Validation of Specified Quantity in Input vulnerability in the TCP proxy plugin of Juniper Networks Junos OS on MX Series with SPC3, and SRX Series allows an unauthenticated, network-based attacker to cause a complete Denial of Service (DoS).&lt;/p&gt;
&lt;p&gt;When TCP proxy is engaged in a flow session, to support ALGs, Advanced Anti-Malware, ICAP or UTM, a TCP packet with specifically malformed TCP header will cause flow processing daemon (flowd) to crash and restart. This causes a complete service outage until the system has automatically recovered.&lt;/p&gt;
&lt;p&gt;This issue affects Junos OS on MX with SPC3, and SRX Series:&lt;/p&gt;
&lt;p&gt;*  23.4 versions before 23.4R2-S7, 
  *  24.2 versions before 24.2R2-S4, 
  *  24.4 versions before 24.4R2-S3,
  *  25.2 versions before 25.2R2.&lt;/p&gt;
&lt;p&gt;This issue does not affect releases before 23.4R1.&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/cve-2026-57023</guid>
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