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.

This issue affects systems with IS-IS configured. For example:

[protocols isis interface lo.0 ...]
[protocols isis interface <interface> ...]
[interfaces <interface> unit <n> family iso]

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen during production usage.

The following software releases have been updated to resolve this specific issue:
Junos OS: 23.2R2, 23.4R1-S2, 23.4R2, 24.1R2, 24.2R1, and all subsequent releases.
Junos OS Evolved: 23.2R2-EVO, 23.4R1-S2-EVO, 23.4R2-EVO, 24.1R2-EVO, 24.2R1-EVO, and all subsequent releases.

This issue is being tracked as 1793982 which is visible on the Customer Support website.

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).

There are no known workarounds for this issue.

2026-01-14: Initial Publication

• KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin Publication Process [juniper.net]
• KB16765: In which releases are vulnerabilities fixed? [juniper.net]
• KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories [juniper.net]
• Report a Security Vulnerability - How to Contact the Juniper Networks Security Incident Response Team