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Vulnerabilities/CVE-2025-21590Public Intelligence Dossier
Source: juniper · Limited verification•Last verified: •Collection Degraded
CVE-2025-21590ListedMEDIUM (raw)CVSS 6.7CWE-653

An Improper Isolation or Compartmentalization vulnerability in the kernel of Juniper Networks Junos OS allows a local attacker with high privileges to compromise the integrity of the device

Published: 12 Mar 2025•Last updated: 01 Oct 2026, 11:53 PM IST•Source identifier: sirt@juniper.net
Dossier completeness: source-provided sections 3 / 3 · rule guidance not available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Listed
Added13 Mar 2025
Due03 Apr 2025
RansomwareUnknown
CVSS score
6.7MEDIUM (raw)
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/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:X/R:X/V:X/RE:X/U:X
Metric sourcesirt@juniper.net
EPSS probability
1.7%0.017
Percentile77th
Weakness type
CWE-653
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

An Improper Isolation or Compartmentalization vulnerability in the kernel of Juniper Networks Junos OS allows a local attacker with high privileges to compromise the integrity of the device. A local attacker with access to the shell is able to inject arbitrary code which can compromise an affected device. This issue is not exploitable from the Junos CLI. This issue affects Junos OS: * All versions before 21.2R3-S9, * 21.4 versions before 21.4R3-S10, * 22.2 versions before 22.2R3-S6, * 22.4 versions before 22.4R3-S6, * 23.2 versions before 23.2R2-S3, * 23.4 versions before 23.4R2-S4, * 24.2 versions before 24.2R1-S2, 24.2R2.

SOC priority

Immediate Attention

Actively exploited

Yes

Publicly disclosed

Unknown

Risk basis: CISA KEV exploitation signal; SOC ecosystem technology relevance; Known exploitation signal from CISA KEV or ransomware metadata

Affected Products & Remediation

1 source-backed product
Affected products and versions (source)
  • juniper junos · < 21.2; 21.2; 21.4; 22.2; 22.4; 23.2; 23.4; 24.2 · NVD CPE · Source
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

  • CISA KEV: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Listed
Exploited (source statement)
Yes
Publicly disclosed (source)
Unknown

CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

No rule-based guidance for this vulnerability class

CISA KEV Record

Catalog entry
13 Mar 2025
Required action due
03 Apr 2025
Known ransomware use
Unknown

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Change History & Source Data

— No recorded material change

CNA / source
sirt@juniper.net
Record status · verification
UPDATED · CISA KEV confirmed
CPE
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*, cpe:2.3:o:juniper:junos:21.2:-:*:*:*:*:*:*, cpe:2.3:o:juniper:junos:21.2:r1:*:*:*:*:*:*, cpe:2.3:o:juniper:junos:21.2:r1-s1:*:*:*:*:*:*, cpe:2.3:o:juniper:junos:21.2:r1-s2:*:*:*:*:*:*, cpe:2.3:o:juniper:junos:21.2:r2:*:*:*:*:*:*, cpe:2.3:o:juniper:junos:21.2:r2-s1:*:*:*:*:*:*, cpe:2.3:o:juniper:junos:21.2:r2-s2:*:*:*:*:*:*, cpe:2.3:o:juniper:junos:21.2:r3:*:*:*:*:*:*, cpe:2.3:o:juniper:junos:21.2:r3-s1:*:*:*:*:*:*

Evidence & Provenance

4 public sources
CISA KEV CatalogAdded 2025-03-13supportportal.juniper.netSource recordnvd.nist.govSource recordcloud.google.comSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2025-21590
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2025-21590
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2025-21590"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library
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SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.