Out-of-bounds Write Vulnerability in Junos OS by Juniper Networks
CVE-2026-102177

7.2HIGH

Key Information:

Vendor

Juniper Networks
Status
Junos Os
Junos Os Evolved
Vendor
CVE Published:
14 October 2026

Badges

👾 Exploit Exists

What is CVE-2026-102177?

An Out-of-bounds Write vulnerability exists in the routing protocol daemon (rpd) of Junos OS and Junos OS Evolved. This flaw permits an adjacent unauthenticated attacker to potentially disrupt services by causing a denial of service when specific configurations, such as IS-IS link protection and backup-selection, are applied. As such, maintaining the integrity and configuration of these networking protocols is critical to safeguarding against potential attacks.

Affected Version(s)

Junos OS 0 < 23.2R2-S7.7

Junos OS 23.4 < 23.4R2-S8.13

Junos OS 24.2 < 24.2R2-S5.5

References

https://supportportal.juniper.net/JSA112187
vendor-advisory

CVSS V4

Score:
7.2
Severity:
HIGH
Confidentiality:
Low
Integrity:
Low
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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