Post Date: 2026/04/28

【Vulnerability Alert】Critical Security Vulnerability in Junos OS MX Series (CVE-2026-33785)

  • Subject: 【Vulnerability Alert】Critical Security Vulnerability in Junos OS MX Series (CVE-2026-33785)


  • Description:
    • Forwarded from Taiwan Computer Emergency Response Team / Coordination Center (TWCERT/CC) Security Alert: TWCERTCC-200-202604-00000007.
    • A critical security vulnerability exists in the CLI of Juniper Networks Junos OS MX Series switches (CVE-2026-33785, CVSS: 8.8). This vulnerability allows an authenticated low-privileged user to execute unauthorized high-privileged commands, potentially leading to unauthorized control of the device.
  • Affected Platforms:
    • Junos OS MX Series: Versions prior to 24.4R2-S3 (exclusive)
    • Junos OS MX Series: Version 25.2R2
  • Recommended Actions:
    • Please update to Junos OS MX Series versions 24.4R2-S3, 25.2R2, 25.4R1 or later.
  • Reference:
    1. https://www.twcert.org.tw/tw/cp-169-10827-3ed3c-1.html

Computer and Communication Center
Network System Division