CVE-2025-21590

MEDIUM CISA KEV EPSS 73.7%
Published Mar 12, 20251y ago · Modified Jun 17, 20261w ago
6.7 CVSS 4.0
Medium
Find Similar
Published Mar 12, 2025 1y ago
Last Modified Jun 17, 2026 1w ago
KEV Listed Mar 13, 2025 1y ago
KEV Due Apr 3, 2025 453d overdue

Description

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.

CVSS Details

Base Score
6.7
Exploitability
—
Impact
—
Vector string
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
Attack Vector Local
Attack Complexity Low
Privileges Required High
User Interaction None
Scope X

Threat Intelligence

CISA Known Exploited Overdue 453d
Added
Mar 13, 2025
Due
Apr 3, 2025

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

EPSS Exploit Probability
73.7% percentile
Exploit & Patch Status
Actively Exploited (KEV)
No Patch Available

Weaknesses 1

CWE-653

Affected Products 82

VendorProductVersionRange
juniperjunos* ≤21.2
juniperjunos21.2any
juniperjunos21.2any
juniperjunos21.2any
juniperjunos21.2any
juniperjunos21.2any
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juniperjunos21.2any
juniperjunos21.2any
juniperjunos21.2any
juniperjunos21.2any
juniperjunos21.4any
juniperjunos21.4any
juniperjunos21.4any
juniperjunos21.4any
juniperjunos21.4any
juniperjunos21.4any
juniperjunos21.4any
juniperjunos21.4any
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juniperjunos21.4any
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juniperjunos21.4any
juniperjunos21.4any
juniperjunos21.4any
juniperjunos21.4any
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juniperjunos21.4any
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juniperjunos22.2any
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juniperjunos22.4any
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juniperjunos22.4any
juniperjunos23.2any
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juniperjunos23.4any
juniperjunos23.4any
juniperjunos23.4any
juniperjunos23.4any
juniperjunos24.2any
juniperjunos24.2any
juniperjunos24.2any
juniperjunos24.2any
juniperjunos24.2any

References 3

  • cloud.google.com https://cloud.google.com/blog/topics/threat-intelligence/china-nexus-espionage-targets-juniper-routers
    Third Party Advisory
  • supportportal.juniper.net https://supportportal.juniper.net/JSA93446
    Vendor Advisory
  • cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21590
    US Government Resource

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.