#VU125558 Improper input validation in Junos OS - CVE-2026-33778

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Main Vulnerability Database Vulnerabilities #VU125558

#VU125558 Improper input validation in Junos OS - CVE-2026-33778

Published: April 9, 2026


Vulnerability identifier: #VU125558
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/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-2026-33778
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Junos OS
Software vendor:
Juniper Networks, Inc.

Description

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper validation of syntactic correctness of input in the IPsec library used by kmd and iked when processing a specifically malformed first ISAKMP packet. A remote attacker can send a specifically malformed first ISAKMP packet to cause a denial of service.

Successful exploitation crashes and restarts the kmd/iked process, which momentarily prevents new security associations from being established. Repeated exploitation can prevent new VPN connections from being established.


Remediation

Install security update from vendor's website.

External links