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Vulnerability record · CVE-2026-57025 · published 9 July 2026

CVE-2026-57025: Juniper junos vulnerability

Juniper · Junos

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.

6.8 CVSS 4.0 Medium EPSS 0.14% · top 97.2% CWE-466 · CWE-466
6.8CVSS 4.0 base score
0.14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
1References
16 Jul 2026Last modified by NVD

Description

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://supportportal.juniper.net/JSA110085 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-36845Juniper Junos OS J-Web PHP variable modification RCEJ-Web in Junos OS on EX Series and SRX Series mishandles the PHP PHPRC environment variable, letting a crafted request alter the PHP execution enviro…KEVEPSS 95%analysed9.8CVE-2020-1631Juniper Junos OS J-Web HTTP service path traversal and local file inclusionThe HTTP/HTTPS service behind J-Web, Web Authentication, Dynamic-VPN, Firewall Authentication Pass-Through with Web-Redirect, and ZTP in Junos OS doe…KEVEPSS 4.8%analysed6.7CVE-2025-21590Juniper Junos OS kernel improper isolation allows local code injectionJunos OS contains an improper isolation or compartmentalization flaw in the kernel that lets a local attacker with shell access inject arbitrary code…KEVEPSS 1.7%analysed5.3CVE-2023-36851Juniper Junos OS SRX J-Web missing authentication allows file upload/downloadJunos OS on SRX Series exposes webauth_operation.php without authentication, letting a network attacker upload and download arbitrary files through J…KEVEPSS 1.1%analysed5.3CVE-2023-36844Juniper Junos OS EX Series J-Web PHP Environment Variable ModificationJ-Web on Junos OS for EX Series fails to properly restrict external PHP variable modification, letting an unauthenticated network attacker alter impo…KEVEPSS 90%analysed5.3CVE-2023-36846Juniper Junos OS SRX J-Web Missing Authentication Allows File UploadJunos OS on SRX Series fails to require authentication for a critical function in user.php reachable through J-Web, letting an unauthenticated networ…KEVEPSS 93%analysed5.3CVE-2023-36847Juniper Junos OS EX Series J-Web installAppPackage.php missing authenticationJunos OS on EX Series exposes installAppPackage.php through J-Web without requiring authentication. An unauthenticated network attacker can upload ar…KEVEPSS 83%analysed10.0CVE-2021-31384Juniper junos improper authorization vulnerabilityDue to a Missing Authorization weakness and Insufficient Granularity of Access Control in a specific device configuration, a vulnerability exists in …EPSS 1.2%

Source: NIST National Vulnerability Database (record CVE-2026-57025), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.