Improper Check for Unusual or Exceptional Conditions in Junos OS and Junos OS Evolved - CVE-2026-33801
Published: July 8, 2026
Vulnerability identifier: #VU137132
CSH Severity: Medium
CVSS v4.0: 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-2026-33801
CWE-ID: CWE-754
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 non-authenticated attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to improper check for unusual or exceptional conditions error in the routing protocol daemon (RPD). A remote non-authenticated attacker can cause a Denial-of-Service (DoS).
Upon receipt of a specifically malformed non-inet/inet6 unicast BGP update, an RPD crash and restart is triggered, which will cause a complete service outage until routing has reconverged.
The rpd crash occurs before the update can be readvertised, so there is no downstream propagation.
How to mitigate CVE-2026-33801
Install updates from vendor's website.