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CVE-2025-21590: Juniper Junos OS Improper Isolation or Compartmentalization Vulnerability

criticalknown exploitedCVE-2025-21590
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Juniper Junos OS contains an improper isolation or compartmentalization vulnerability. This vulnerability could allows a local attacker with high privileges to inject arbitrary code.

CSIRTS triage

vendor: Juniperproduct: Junos OSRemote code execution
What
This vulnerability allows a local attacker with high privileges to inject arbitrary code.
Who is affected
Local attackers with high privileges on Junos OS are affected.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Apply the latest security patches provided by Juniper.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2025-03-13
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-21590

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-21590coverage & exploitation statusNVD · CVE.org

Recent advisories for Juniper Junos OS

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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