{"id":"CVE-2026-57025","aliases":["EUVD-2026-42713","GHSA-q958-7f7x-pmq4"],"status":"published","title":"Junos OS and Junos OS Evolved: EX Series, QFX Series, MX Series: A specific 'show l2-learning/ethernet-switching' command causes l2ald crash","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).\n\nOn 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.\n\nThis issue affects EX Series, QFX Series, MX Series:\nJunos OS:\n\n\n  *  all versions before 23.2R2-S7,\n  *  23.4 versions before 23.4R2-S7,\n  *  24.2 versions before 24.2R2,\n  *  24.4 versions before 24.4R1-S2.\n\n\n\nJunos OS Evolved:\n  *  all versions before 23.2R2-S7-EVO,\n  *  23.4 versions before 23.4R2-S8-EVO,\n  *  24.2 versions before 24.2R2-EVO,\n  *  24.4 versions before 24.4R1-S3-EVO.","severity":{"version":"4.0","score":6.8,"vector":"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.0014,"percentile":0.03442,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-466"],"published":"2026-07-09T21:07:20Z","modified":"2026-07-16T09:16:18Z","products":[{"vendor":"juniper","product":"junos"},{"vendor":"juniper","product":"junos_os_evolved"},{"vendor":"juniper networks","product":"junos os"},{"vendor":"juniper networks","product":"junos os evolved"}],"references":[{"url":"https://supportportal.juniper.net/JSA110085","tags":["vendor-advisory","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-57025"},{"url":"https://github.com/advisories/GHSA-q958-7f7x-pmq4"}],"sources":{"cve":[{"id":"CVE-2026-57025","title":"Junos OS and Junos OS Evolved: EX Series, QFX Series, MX Series: A specific 'show l2-learning/ethernet-switching' command causes l2ald crash","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).\n\nOn 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.\n\nThis issue affects EX Series, QFX Series, MX Series:\nJunos OS:\n\n\n  *  all versions before 23.2R2-S7,\n  *  23.4 versions before 23.4R2-S7,\n  *  24.2 versions before 24.2R2,\n  *  24.4 versions before 24.4R1-S2.\n\n\n\nJunos OS Evolved:\n  *  all versions before 23.2R2-S7-EVO,\n  *  23.4 versions before 23.4R2-S8-EVO,\n  *  24.2 versions before 24.2R2-EVO,\n  *  24.4 versions before 24.4R1-S3-EVO.","status":"published","published":"2026-07-09T21:07:20.486Z","modified":"2026-07-16T08:26:17.852Z","cvss":[{"version":"4.0","score":6.8,"vector":"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","level":"medium","assessor":"cna"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-466"],"updated_at":"2026-11-02T13:43:44.898272Z"}],"euvd":[{"id":"EUVD-2026-42713","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).\n\nOn 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.\n\nThis issue affects EX Series, QFX Series, MX Series:\nJunos OS:\n\n\n  *  all versions before 23.2R2-S7,\n  *  23.4 versions before 23.4R2-S7,\n  *  24.2 versions before 24.2R2,\n  *  24.4 versions before 24.4R1-S2.\n\n\n\nJunos OS Evolved:\n  *  all versions before 23.2R2-S7-EVO,\n  *  23.4 versions before 23.4R2-S8-EVO,\n  *  24.2 versions before 24.2R2-EVO,\n  *  24.4 versions before 24.4R1-S3-EVO.","status":"published","published":"2026-07-09T21:07:20Z","modified":"2026-07-16T08:26:17Z","cvss":[{"version":"4.0","score":6.8,"vector":"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","level":"medium"}],"updated_at":"2026-11-02T18:19:52.35951Z"}],"ghsa":[{"id":"GHSA-q958-7f7x-pmq4","title":"A Return of Pointer Value Outside of Expected Range vulnerability in the fileio library of...","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).\n\nOn 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.\n\nThis issue affects EX Series, QFX Series, MX Series:\nJunos OS:\n\n\n  *  all versions before 23.2R2-S7,\n  *  23.4 versions before 23.4R2-S7,\n  *  24.2 versions before 24.2R2,\n  *  24.4 versions before 24.4R1-S2.\n\n\n\nJunos OS Evolved:\n  *  all versions before 23.2R2-S7-EVO,\n  *  23.4 versions before 23.4R2-S8-EVO,\n  *  24.2 versions before 24.2R2-EVO,\n  *  24.4 versions before 24.4R1-S3-EVO.","status":"published","published":"2026-07-10T00:31:26Z","modified":"2026-07-10T00:31:33Z","cvss":[{"version":"4.0","score":6.8,"vector":"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:A/V:X/RE:M/U:X","level":"medium"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-466"],"updated_at":"2026-11-02T15:09:22.722529Z"}],"nvd":[{"id":"CVE-2026-57025","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).\n\nOn 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.\n\nThis issue affects EX Series, QFX Series, MX Series:\nJunos OS:\n\n\n  *  all versions before 23.2R2-S7,\n  *  23.4 versions before 23.4R2-S7,\n  *  24.2 versions before 24.2R2,\n  *  24.4 versions before 24.4R1-S2.\n\n\n\nJunos OS Evolved:\n  *  all versions before 23.2R2-S7-EVO,\n  *  23.4 versions before 23.4R2-S8-EVO,\n  *  24.2 versions before 24.2R2-EVO,\n  *  24.4 versions before 24.4R1-S3-EVO.","status":"published","published":"2026-07-09T22:17:07.747Z","modified":"2026-07-16T09:16:18.65Z","cvss":[{"version":"4.0","score":6.8,"vector":"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:A/V:X/RE:M/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-466"],"updated_at":"2026-11-02T14:12:28.4135Z"}]}}