SB2026070858 - Unchecked Input for Loop Condition in Junos OS

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Main Vulnerability Database SB2026070858

SB2026070858 - Unchecked Input for Loop Condition in Junos OS

Published: July 8, 2026

Security Bulletin ID SB2026070858
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) Unchecked Input for Loop Condition (CVE-ID: CVE-2026-33800)

CWE-ID: CWE-606 - Unchecked Input for Loop Condition

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 unchecked input for loop condition error in the Packet Forwarding Engine (pfe). A remote non-authenticated attacker can cause a Denial-of-Service (DoS).

Micro-BFD session flaps generate respective up/down events which are queued by PFEMAN for processing.

Especially in a Virtual-Chassis (VC) scenario with localitybias configured, processing takes a significant amount of time for each event.


Remediation

Install update from vendor's website.

References