Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2025-21590

CVE-2025-21590MEDIUM

Juniper Networks Junos OS — Junos OS: An local attacker with shell access can execute arbitrary code

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   L   L   N   H   N   N   H   N    6.7   .0171   76.6   YES

AFFECTED
  Product   Versions     Fixed
  Junos OS  unspecified  —

TIMELINE
  Dec 26  Reserved by juniper
  Mar 12  Published (CNA: juniper)
  Mar 13  Added to CISA KEV, remediation due 2025-04-03

CWE-653 · CNA: juniper · CVSS v4.0 · 3 references · NVD status: Analyzed · KEV due April 3, 2025

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
December 26, 2024	Reserved	Reserved by juniper
March 12, 2025	Published	Published (CNA: juniper)
March 13, 2025	KEV ADDED	Added to CISA KEV, remediation due 2025-04-03

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Juniper Networks	Junos OS	—	—	—

Weaknesses

CWE-653

References (3)

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

Authoritative record: CVE-2025-21590 at cve.org

Vendors: juniper networks

Weaknesses: CWE-653

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2025-21590 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.