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    <link>https://cve.radiocsirt.org</link>
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    <lastBuildDate>Mon, 12 Oct 2026 18:34:26 +0000</lastBuildDate>
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      <title>CVE-2026-21912 — Junos OS: MX10k Series: 'show system firmware' CLI command may lead to LC480 or LC2101 line card reset</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-21912</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Juniper Networks Junos OS&lt;/p&gt;
&lt;p&gt;A Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in the method to collect FPC Ethernet firmware statistics of Juniper Networks Junos OS on MX10k Series allows a local, low-privileged attacker executing the &amp;#39;show system firmware&amp;#39; CLI command to cause an LC480 or LC2101 line card to reset.&lt;/p&gt;
&lt;p&gt;On MX10k Series systems with LC480 or LC2101 line cards, repeated execution of the &amp;#39;show system firmware&amp;#39; CLI command can cause the line card to crash and restart. Additionally, some time after the line card crashes, chassisd may also crash and restart, generating a core dump.This issue affects Junos OS on MX10k Series:&lt;/p&gt;
&lt;p&gt;*  all versions before 21.2R3-S10, 
  *  from 21.4 before 21.4R3-S9, 
  *  from 22.2 before 22.2R3-S7, 
  *  from 22.4 before 22.4R3-S6, 
  *  from 23.2 before 23.2R2-S2, 
  *  from 23.4 before 23.4R2-S3, 
  *  from 24.2 before 24.2R2.&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;A Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in the method to collect FPC Ethernet firmware statistics of Juniper Networks Junos OS on MX10k Series allows a local, low-privileged attacker executing the &amp;#39;show system firmware&amp;#39; CLI command to cause an LC480 or LC2101 line card to reset.&lt;/p&gt;
&lt;p&gt;On MX10k Series systems with LC480 or LC2101 line cards, repeated execution of the &amp;#39;show system firmware&amp;#39; CLI command can cause the line card to crash and restart. Additionally, some time after the line card crashes, chassisd may also crash and restart, generating a core dump.This issue affects Junos OS on MX10k Series:&lt;/p&gt;
&lt;p&gt;*  all versions before 21.2R3-S10, 
  *  from 21.4 before 21.4R3-S9, 
  *  from 22.2 before 22.2R3-S7, 
  *  from 22.4 before 22.4R3-S6, 
  *  from 23.2 before 23.2R2-S2, 
  *  from 23.4 before 23.4R2-S3, 
  *  from 24.2 before 24.2R2.&lt;/p&gt;</content:encoded>
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