{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2025-59957", "assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "state": "PUBLISHED", "assignerShortName": "juniper", "dateReserved": "2025-09-23T18:19:06.954Z", "datePublished": "2025-10-09T15:43:23.110Z", "dateUpdated": "2025-10-09T19:49:29.942Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "platforms": ["EX4600", "QFX5000"], "product": "Junos OS", "vendor": "Juniper Networks", "versions": [{"lessThan": "21.4R3", "status": "affected", "version": "0", "versionType": "semver"}, {"lessThan": "22.2R3-S3", "status": "affected", "version": "22.2", "versionType": "semver"}]}], "datePublic": "2025-10-08T12:20:00.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "An Origin Validation Error vulnerability in an insufficient protected file of Juniper Networks Junos OS on&nbsp;EX4600 Series and QFX5000 Series allows an unauthenticated attacker with physical access to the device to create a backdoor which allows complete control of the system.<br><br>When a device isn't configured with a root password, an attacker can modify a specific file. It's contents will be added to the Junos configuration of the device without being visible. This allows for the addition of any configuration unknown \n\n<span style=\"background-color: rgb(255, 255, 255);\">to the actual operator,&nbsp;</span>which includes users, IP addresses and other configuration which could allow unauthorized access to the device.<br>This exploit is persistent across reboots and even zeroization.<br><br>The indicator of compromise is a modified /etc/config/&lt;platform&gt;-defaults[-flex].conf file. Review that file for unexpected configuration statements, or compare it to an unmodified version which can be&nbsp;<span style=\"background-color: rgb(255, 255, 255);\">extracted from the original Juniper software image file</span>. 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