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CVE-2026-21902 (GCVE-0-2026-21902)

Vulnerability from cvelistv5 – Published: 2026-02-25 16:59 – Updated: 2026-03-04 04:55
VLAI Shadowserver Previdian
Title
Junos OS Evolved: PTX Series: A vulnerability allows a unauthenticated, network-based attacker to execute code as root
Summary
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. 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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3 (Critical)
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/AU:Y/R:U/RE:M/U:Red
SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-25 00:00 UTC
CWE
  • CWE-732 - Incorrect Permission Assignment for Critical Resource
Assigner
References
Impacted products
Vendor Product Version CPE status
Juniper Networks Junos OS Evolved Affected: 25.4 , < 25.4R1-S1-EVO, 25.4R2-EVO (semver)
Unaffected: 0 , < 25.4R1-EVO (semver)
guessed Create a notification for this product.
Date Public
2026-02-25 05:00
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 68c84b40-0817-4ba4-8223-b2429acc5f7c

Vulnerability ID: CVE-2026-21902

Status: Confirmed

Status Updated: 2026-03-20 00:00 UTC

Exploited: Yes

Characteristics
Severity: 93.0
Timestamps
First Seen: 2026-03-14
Asserted: 2026-03-14
Last Seen: 2026-03-20
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Juniper / Junos OS Evolved on PTX Series | Class: embedded-system | Severity: Critical (CVSS 9.3) | IoT: no | In CISA KEV: no | Honeypot connections on 2026-03-20: 45
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 1
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class embedded-system
7D Avg 1
Vendor Juniper
30D Avg 0
90D Avg 0
Product Junos OS Evolved on PTX Series
Cisa Kev no
Connections 45
Observation Date 2026-03-20
Vulnerability Class CVSS
Vulnerability Score 9.3
Vulnerability Severity Critical
References
Created: 2026-06-30 09:41 UTC | Updated: 2026-06-30 10:01 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: dbdb5ef3-f301-437b-9948-53cd5f506c84

Vulnerability ID: CVE-2026-21902

Status: Confirmed

Status Updated: 2026-03-19 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-03-19
Asserted: 2026-03-19
Scope
Notes: KEVIntel entry: Junos OS Evolved: PTX Series: A vulnerability allows a unauthenticated, network-based attacker to execute code as root | Affected: Juniper Networks / Junos OS Evolved | CVSS: 9.3 (CRITICAL) | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Junos OS Evolved: PTX Series: A vulnerability allows a unauthenticated, network-based attacker to execute code as root
Vendor Juniper Networks
Product Junos OS Evolved
Added Date 2026-03-19T00:00:00.000Z
Cvss Score 9.3
Epss Score None
Cvss Severity CRITICAL
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-06-23 14:03 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 9.8, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"CRITICAL\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}, {\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"USER\", \"baseScore\": 9.3, \"Automatable\": \"YES\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"CRITICAL\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"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/AU:Y/R:U/RE:M/U:Red\", \"providerUrgency\": \"RED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"HIGH\", \"subAvailabilityImpact\": \"LOW\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"HIGH\", \"vulnerabilityResponseEffort\": \"MODERATE\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"Juniper Networks\", \"product\": \"Junos OS Evolved\", \"versions\": [{\"status\": \"affected\", \"version\": \"25.4\", \"lessThan\": \"25.4R1-S1-EVO, 25.4R2-EVO\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"25.4R1-EVO\", \"versionType\": \"semver\"}], \"platforms\": [\"PTX Series\"], \"defaultStatus\": \"unaffected\"}], \"exploits\": [{\"lang\": \"en\", \"value\": \"Juniper SIRT is not aware of any malicious exploitation of this vulnerability.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Juniper SIRT is not aware of any malicious exploitation of this vulnerability.\", \"base64\": false}]}], \"solutions\": [{\"lang\": \"en\", \"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*\\u00a0Future Release\", \"supportingMedia\": [{\"type\": \"text/html\", \"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.\u003cbr\u003e*\u0026nbsp;Future Release\", \"base64\": false}]}], \"datePublic\": \"2026-02-25T05:00:00.000Z\", \"references\": [{\"url\": \"https://supportportal.juniper.net/JSA107128\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://kb.juniper.net/JSA107128\", \"tags\": [\"vendor-advisory\"]}], \"workarounds\": [{\"lang\": \"en\", \"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 \u0027request pfe anomalies disable\u0027.\", \"supportingMedia\": [{\"type\": \"text/html\", \"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.\u003cbr\u003ePlease ensure such filters only permit explicitly required connections and block all others.\u003cbr\u003e\u003cbr\u003eAlso this service can be disabled by \u0027\u003cspan style=\\\"background-color: rgb(255, 255, 255);\\\"\u003erequest pfe anomalies disable\u003c/span\u003e\u0027.\", \"base64\": false}]}], \"x_generator\": {\"engine\": \"Vulnogram 0.1.0-dev\"}, \"descriptions\": [{\"lang\": \"en\", \"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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"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.\u003cbr\u003e\u003cbr\u003eThe 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.\u003cbr\u003ePlease note that this service is enabled by default as no specific configuration is required.\u003cbr\u003e\u003cbr\u003e\u003cp\u003eThis issue affects Junos OS Evolved on PTX Series:\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003cul\u003e\u003cli\u003e25.4 versions before 25.4R1-S1-EVO, 25.4R2-EVO.\u003c/li\u003e\u003c/ul\u003e\u003cp\u003e\u003c/p\u003eThis issue does not affect Junos OS Evolved versions before 25.4R1-EVO.\u003cbr\u003e\u003cbr\u003eThis issue does not affect Junos OS.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-732\", \"description\": \"CWE-732 Incorrect Permission Assignment for Critical Resource\"}]}], \"providerMetadata\": {\"orgId\": \"8cbe9d5a-a066-4c94-8978-4b15efeae968\", \"shortName\": \"juniper\", \"dateUpdated\": \"2026-02-25T16:59:10.672Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-21902\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-03-04T04:55:12.668Z\", \"dateReserved\": \"2026-01-05T17:32:48.709Z\", \"assignerOrgId\": \"8cbe9d5a-a066-4c94-8978-4b15efeae968\", \"datePublished\": \"2026-02-25T16:59:10.672Z\", \"assignerShortName\": \"juniper\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.