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: 6.9 [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]
CVE-ID: CVE-2026-33797
CWE-ID: CWE-20
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Junos OS
Junos OS Evolved
Junos OS Evolved
How to mitigate CVE-2026-33797
Install security update from vendor's website.
Junos OS - addressed in versions 25.2R2, 25.4R1
Junos OS Evolved - addressed in versions 25.2R2-EVO, 25.4R1-EVO
Junos OS Evolved - addressed in versions 25.2R2-EVO, 25.4R1-EVO