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

A local attacker, with administrative privileges, can achieve partial data exposure, arbitrary modification of data. Federal agencies are required to remediate by 2025-04-03 under CISA BOD 22-01.

This is a Software Vulnerability (CWE-653) (CWE-653) vulnerability in Juniper Junos OS. 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. Exploitation requires local access, low attack complexity, an administrative account, and no user interaction required.

Probably yes if any of these apply:

CISA added this CVE to the Known Exploited Vulnerabilities catalog on 2025-03-13 based on evidence of active exploitation in the wild. Federal agencies required to remediate by 2025-04-03.