CVE-2026-21902Public exploitNetwork attack vector

Unauthenticated root code execution via exposed anomaly API

Published Feb 25, 2026 · Updated Feb 25, 2026

Incorrect permissions in Junos OS Evolved 25.4 on PTX Series allow remote attackers to execute code as root through the anomaly service. The externally exposed API on TCP port 8160 accepts unauthenticated command definitions of type RE-SHELL, then executes them through enabled DAG instances. The service is enabled by default, so network reachability is the only gate; successful exploitation gives complete control of the device.

CVSS severity9.3
Critical
EPSS probability17.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect permissions in Junos OS Evolved 25.4 on PTX Series allow remote attackers to execute code as root through the anomaly service. The externally exposed API on TCP port 8160 accepts unauthenticated command definitions of type RE-SHELL, then executes them through enabled DAG instances. The service is enabled by default, so network reachability is the only gate; successful exploitation gives complete control of the device.

The record

CVE
CVE-2026-21902
Published
Feb 25, 2026
Updated
Feb 25, 2026
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-732, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=25.4 <25.4R1-S1-EVO, 25.4R2-EVO

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=25.4 <25.4R1-S1-EVO, 25.4R2-EVO

Published CVSS scores

9.8Juniper Networks, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3Juniper Networks, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-732Incorrect Permission Assignment for Critical Resource
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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