SB2026070871 - Denial of service in Junos OS

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2026070871

SB2026070871 - Denial of service in Junos OS

Published: July 8, 2026

Security Bulletin ID SB2026070871
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Race condition (CVE-ID: CVE-2026-57030)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/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 attacker to cause a denial of service.

The vulnerability exists due to a race condition in the packet forwarding engine (PFE) when removing flow sessions during stateful traffic processing. A remote attacker can send network traffic to cause a denial of service.

The issue can cause flow sessions to remain with unexpectedly large timeout values, leading to accumulation of invalidated sessions; under some conditions forwarding stops and manual recovery with a reboot may be required, or flowd may core and trigger an automatic reboot.


Remediation

Install update from vendor's website.

References