CVE-2025-21590: Junos OS: An local attacker with shell access can execute arbitrary code
In CISA’s Known Exploited Vulnerabilities catalog: Juniper Junos OS Improper Isolation or Compartmentalization Vulnerability.
Added , federal remediation due . Known ransomware use: Unknown.
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.
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.
Vector CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N · CWE-653
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
Juniper Networks: Junos OS
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- cloud.google.com/blog/topics/threat-intelligence/china-nexus-espionage-targets-juniper… (opens in new tab)
- supportportal.juniper.net/JSA93446 (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)