SB2026070846 - Improper Check for Unusual or Exceptional Conditions in Junos OS Evolved and Junos OS

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Main Vulnerability Database SB2026070846

SB2026070846 - Improper Check for Unusual or Exceptional Conditions in Junos OS Evolved and Junos OS

Published: July 8, 2026

Security Bulletin ID SB2026070846
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Adjecent network
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2026-33801)

CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions

CVSSv4: 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


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.


Remediation

Install update from vendor's website.

References