Vulnerability in Juniper Junos
CVE-2025-21596
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (3.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 3.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: -0.000
Affected products
- Juniper Junos — versions 21.4, 22.2, 22.3
- Juniper Srx1500
- Juniper Srx4100
- Juniper Srx4200
- Juniper Networks Junos OS — versions 0, 22.2, 22.3
Weakness classification (CWE)
References
- supportportal.juniper.net/JSA92864 (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-21596?
- CVE-2025-21596 is a medium-severity vulnerability in Juniper Junos, classified under Improper Handling of Exceptional Conditions. CVSS score: 5.5/10. Published 2025-01-09.
- How severe is CVE-2025-21596?
- Medium severity. CVSS v3 base score is 5.5 out of 10.