Input validation error in Junos OS and Junos OS Evolved - CVE-2026-33797
Published: May 8, 2026
Vulnerability identifier: #VU130692
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-33797
CWE-ID: CWE-20
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vendor: Juniper Networks, Inc.
Affected software:
Junos OS
Junos OS Evolved
Junos OS
Junos OS Evolved
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in the BGP session handling logic when processing a specific genuine BGP packet in an already established BGP session. A remote attacker can send a specific genuine BGP packet to cause a denial of service.
Repeated packet transmission can sustain the denial of service. Both eBGP and iBGP are affected, and the issue applies to both IPv4 and IPv6.
How to mitigate CVE-2026-33797
Install security update from vendor's website.