CVE-2025-21596: Junos OS: SRX1500,SRX4100,SRX4200: Execution of low-privileged CLI command results in chassisd crash
First published: Thu Jan 09 2025(Updated: )
An Improper Handling of Exceptional Conditions vulnerability in the command-line processing of Juniper Networks Junos OS on SRX1500, SRX4100, and SRX4200 devices allows a local, low-privileged authenticated attacker executing the 'show chassis environment pem' command to cause the chassis daemon (chassisd) to crash and restart, resulting in a temporary Denial of Service (DoS). However, repeated execution of this command will eventually cause the chassisd process to fail to restart, impacting packet processing on the system. This issue affects Junos OS on SRX1500, SRX4100, SRX4200: * All versions before 21.4R3-S9, * from 22.2 before 22.2R3-S5, * from 22.3 before 22.3R3-S4, * from 22.4 before 22.4R3-S4, * from 23.2 before 23.2R2-S3, * from 23.4 before 23.4R2-S1.
Credit: sirt@juniper.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Juniper Junos | <21.4R3-S9>22.2<undefined>22.3<undefined>22.4<undefined>23.2<undefined>23.4<undefined |
Remedy
The following software releases have been updated to resolve this specific issue: 21.4R3-S9, 22.2R3-S5, 22.3R3-S4, 22.4R3-S4, 23.2R2-S3, 23.4R2-S1, 24.2R1, and all subsequent releases.
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2025-21596?
CVE-2025-21596 is classified as a medium severity vulnerability.
How can I mitigate CVE-2025-21596?
To mitigate CVE-2025-21596, update the Junos OS to versions that are not affected, specifically versions 21.4R3-S9 or newer.
Who is affected by CVE-2025-21596?
CVE-2025-21596 affects local, low-privileged authenticated users on Juniper Networks SRX1500, SRX4100, and SRX4200 devices running specific versions of Junos OS.
What does CVE-2025-21596 allow an attacker to do?
CVE-2025-21596 allows a low-privileged authenticated attacker to exploit the command-line processing to cause a denial of service.
When was CVE-2025-21596 published?
CVE-2025-21596 was published on March 1, 2025.
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