The On-Box Anomaly detection framework should only be reachable by other internal processes over the internal routing instance, but not over an externally exposed port. With the ability to access and manipulate the service to execute code as root a remote attacker can take complete control of the device. Please note that this service is enabled by default as no specific configuration is required.
This issue affects Junos OS Evolved on PTX Series:
25.4 versions before 25.4R1-S1-EVO, 25.4R2-EVO.
This issue does not affect Junos OS Evolved versions before 25.4R1-EVO.
This issue does not affect Junos OS."
}
],
"value": "An Incorrect Permission Assignment for Critical Resource vulnerability in the On-Box Anomaly detection framework of Juniper Networks Junos OS Evolved on PTX Series allows an unauthenticated, network-based attacker to execute code as root.\n\nThe On-Box Anomaly detection framework should only be reachable by other internal processes over the internal routing instance, but not over an externally exposed port. With the ability to access and manipulate the service to execute code as root a remote attacker can take complete control of the device.\nPlease note that this service is enabled by default as no specific configuration is required.\n\nThis issue affects Junos OS Evolved on PTX Series:\n\n\n\n * 25.4 versions before 25.4R1-S1-EVO, 25.4R2-EVO.\n\n\n\n\nThis issue does not affect Junos OS Evolved versions before 25.4R1-EVO.\n\nThis issue does not affect Junos OS."
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}
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"confidentialityImpact": "HIGH",
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"Recovery": "USER",
"Safety": "NOT_DEFINED",
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"dateUpdated": "2026-02-25T16:59:10.672Z"
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"references": [
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"tags": [
"vendor-advisory"
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"url": "https://supportportal.juniper.net/JSA107128"
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{
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"url": "https://kb.juniper.net/JSA107128"
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"value": "The following software releases have been updated to resolve this specific issue: 25.4R1-S1-EVO, 25.4R2-EVO*, 26.2R1-EVO*, and all subsequent releases. * Future Release"
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"value": "The following software releases have been updated to resolve this specific issue: 25.4R1-S1-EVO, 25.4R2-EVO*, 26.2R1-EVO*, and all subsequent releases.\n* Future Release"
}
],
"source": {
"advisory": "JSA107128",
"defect": [
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],
"discovery": "INTERNAL"
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"title": "Junos OS Evolved: PTX Series: A vulnerability allows a unauthenticated, network-based attacker to execute code as root",
"workarounds": [
{
"lang": "en",
"supportingMedia": [
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"value": "To reduce the risk of exploitation of this issue, use access lists or firewall filters to limit access to only trusted networks and hosts. Please ensure such filters only permit explicitly required connections and block all others.
Also this service can be disabled by 'request pfe anomalies disable'."
}
],
"value": "To reduce the risk of exploitation of this issue, use access lists or firewall filters to limit access to only trusted networks and hosts.\nPlease ensure such filters only permit explicitly required connections and block all others.\n\nAlso this service can be disabled by 'request pfe anomalies disable'."
}
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"references": [
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"url": "https://github.com/watchtowrlabs/watchTowr-vs-JunosEvolved-CVE-2026-21902/blob/main/watchTowr-vs-JunosEvolved-CVE-2026-21902.py",
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"metrics": [
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"other": {
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"content": {
"timestamp": "2026-02-25T00:00:00+00:00",
"options": [
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{
"Automatable": "yes"
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{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3",
"id": "CVE-2026-21902"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"dateUpdated": "2026-03-04T04:55:12.668Z"
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}