Junos OS and Junos OS Evolved: Receipt of specific IS-IS update packet causes memory leak leading to RPD crash

Summary

A Missing Release of Memory after Effective Lifetime vulnerability in the routing protocol daemon (rpd) Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated attacker controlling an adjacent IS-IS neighbor to send a specific update packet causing a memory leak. Continued receipt and processing of these packets will exhaust all available memory, crashing rpd and creating a Denial of Service (DoS) condition. Memory usage can be monitored through the use of the 'show task memory detail' command. For example: user@junos> show task memory detail | match ted-infra   TED-INFRA-COOKIE           25   1072     28   1184     229 user@junos> show task memory detail | match ted-infra   TED-INFRA-COOKIE           31   1360     34   1472     307 This issue affects: Junos OS:  • from 23.2 before 23.2R2,  • from 23.4 before 23.4R1-S2, 23.4R2,  • from 24.1 before 24.1R2;  Junos OS Evolved:  • from 23.2 before 23.2R2-EVO,  • from 23.4 before 23.4R1-S2-EVO, 23.4R2-EVO,  • from 24.1 before 24.1R2-EVO. This issue does not affect Junos OS versions before 23.2R1 or Junos OS Evolved versions before 23.2R1-EVO.

Timeline

1. Jan 15, 2026, 8:22 PM UTCCVE published
2. Jan 15, 2026, 8:52 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Jan 15, 2026, 8:52 PM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS

  From 23.2 · fixed in 23.2R2; From 24.1 · fixed in 24.1R2

• Juniper Networks Junos OS Evolved

  From 23.2 · fixed in 23.2R2-EVO; From 24.1 · fixed in 24.1R2-EVO

References 2