Memory Leak Vulnerability in Juniper Networks Junos OS and Junos OS Evolved
CVE-2026-21909

7.1HIGH

Key Information:

Vendor

Juniper Networks
Status
Junos Os
Junos Os Evolved
Vendor
CVE Published:
15 January 2026

Badges

👾 Exploit Exists

What is CVE-2026-21909?

A vulnerability in Juniper Networks' routing protocol daemon (rpd) within Junos OS and Junos OS Evolved allows an unauthenticated attacker positioned as an adjacent IS-IS neighbor to exploit the system by sending specific update packets. This results in a memory leak that can exhaust system resources, leading to a Denial of Service (DoS) condition, which can disrupt normal network operations. It is crucial for users to regularly monitor memory usage to mitigate the impact of this vulnerability.

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Affected Version(s)

Junos OS 23.2 < 23.2R2

Junos OS 23.4 < 23.4R1-S2, 23.4R2

Junos OS 24.1 < 24.1R2

References

https://supportportal.juniper.net/JSA106008
vendor-advisory
https://kb.juniper.net/JSA106008
vendor-advisory

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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