SB2026070852 - NULL pointer dereference in Junos OS Evolved and Junos OS

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Main Vulnerability Database SB2026070852

SB2026070852 - NULL pointer dereference in Junos OS Evolved and Junos OS

Published: July 8, 2026

Security Bulletin ID SB2026070852
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) NULL pointer dereference (CVE-ID: CVE-2026-21901)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local privileged user to perform a denial of service (DoS) attack.

The vulnerability exists due to null pointer dereference error in the management daemon (mgd). A local privileged user can create a Denial of Service (DoS).

A local high-privileged user configuring or deactivating a specific 'system services ssh' configuration parameter can exploit a null pointer dereference in 1 of the functions used by SSH.

The function attempts to dereference a null pointer when accessing certain configuration data, resulting in an mgd process crash and restart.


Remediation

Install update from vendor's website.

References