CVSS: v3.1: 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)CVSS: v4.0: 6.8 (CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/RE:M)
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' 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:
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue was found during internal product security testing or research.
This issue has been assigned CVE-2026-57025.
The following software releases have been updated to resolve this specific issue:Junos OS: 23.2R2-S7, 23.4R2-S7, 24.2R2, 24.4R1-S2, 24.4R2, 25.2R1, and all subsequent releases;Junos OS Evolved: 23.2R2-S7-EVO, 23.4R2-S8-EVO, 24.2R2-EVO, 24.4R1-S3-EVO, 24.4R2-EVO, 25.2R1-EVO, and all subsequent releases.
This issue is being tracked as 1861779 which is visible on the Customer Support website.
Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).
There are no known workarounds for this issue.To reduce the risk of exploitation use access lists or firewall filters to limit access to the CLI only from trusted hosts and administrators.
2026-07-08: Initial Publication