Memory leak in Junos OS and Junos OS Evolved - CVE-2026-33780
Published: May 8, 2026
Vulnerability identifier: #VU130694
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-33780
CWE-ID: CWE-401
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerable software:
Junos OS
Junos OS Evolved
Junos OS
Junos OS Evolved
Software vendor:
Juniper Networks, Inc.
Juniper Networks, Inc.
Description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to missing release of memory after effective lifetime in the Layer 2 Address Learning Daemon (l2ald) when processing churn of ESI routes in an EVPN-MPLS scenario. A remote attacker can trigger ESI route churn to cause a denial of service.
The device must be configured for EVPN-MPLS to be exposed to this issue.
Remediation
Install security update from vendor's website.