Reachable Assertion Vulnerability in Junos OS by Juniper Networks
CVE-2026-102034

7.1HIGH

Key Information:

Vendor

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

Badges

👾 Exploit Exists

What is CVE-2026-102034?

A reachable assertion vulnerability exists in the l2ald daemon of Juniper Networks' Junos OS and Junos OS Evolved. This flaw permits an attacker with access to a configured ICCP peer to exploit the system by sending a malformed MC-LAG message, potentially leading to a denial of service. Organizations should ensure that their systems are properly secured and monitor for any unusual activity related to MC-LAG messaging.

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:
7.1
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

.