CVE-2026-57025: Juniper Junos

Medium severity, CVSS 5.5. EPSS: 0.1% chance of exploitation in the next 30 days.

A Return of Pointer Value Outside of Expected Range vulnerability in the fileio library of Juniper Networks Junos OS and Junos OS Evolved allows a local, low-privilged attacker to cause a Denial-of-Service (DoS). On EX Series, QFX Series and MX Series a low-privileged attacker issuing a specific 'show l2-learning' or 'show ethernet-switching' command will cause an l2ald crash which will lead to a temporary service impact for all layer 2 services until the process has automatically restarted. This issue affects EX Series, QFX Series, MX Series: Junos OS: * all versions before 23.2R2-S7, * 23.4 versions before 23.4R2-S7, * 24.2 versions before 24.2R2, * 24.4 versions before 24.4R1-S2. Junos OS Evolved: * all versions before 23.2R2-S7-EVO, * 23.4 versions before 23.4R2-S8-EVO, * 24.2 versions before 24.2R2-EVO, * 24.4 versions before 24.4R1-S3-EVO.

Affected products

• Juniper Junos: before 23.2 (fixed in 23.2); version 23.2 only; version 23.4 only; version 24.2 only; version 24.4 only
• Juniper Junos OS Evolved: before 23.2 (fixed in 23.2); version 23.2 only; version 23.4 only; version 24.2 only; version 24.4 only

Published 2026-07-09. Last modified 2026-07-16.