CVE-2025-21596— Junos OS: SRX1500,SRX4100,SRX4200: Execution of low-privileged CLI command results in chassisd crash
Quick assessment
Affected
Juniper Networks Junos OS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Juniper Networks Junos OS是美国瞻博网络（Juniper Networks）公司的一套专用于该公司的硬件设备的网络操作系统。该操作系统提供了安全编程接口和Junos SDK。 Juniper Networks Junos OS存在安全漏洞，该漏洞源于命令行处理异常条件不当，导致底盘守护进程(chassisd)可通过特定命令被本地低权限用户触发崩溃和重启，造成临时拒绝服务。
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-21596
Vulnerability Information
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Vulnerability Title
Junos OS: SRX1500,SRX4100,SRX4200: Execution of low-privileged CLI command results in chassisd crash
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对异常条件的处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks Junos OS是美国瞻博网络（Juniper Networks）公司的一套专用于该公司的硬件设备的网络操作系统。该操作系统提供了安全编程接口和Junos SDK。 Juniper Networks Junos OS存在安全漏洞，该漏洞源于命令行处理异常条件不当，导致底盘守护进程(chassisd)可通过特定命令被本地低权限用户触发崩溃和重启，造成临时拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Juniper Networks | Junos OS | 0 ~ 21.4R3-S9 | - |
|
II. Public POCs for CVE-2025-21596
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2025-21596 (1)
Same Patch Batch · Juniper Networks · 2025-01-09 · 7 CVEs total
| CVE-2025-21598 | 7.5 HIGH | Junos OS and Junos OS Evolved: When BGP traceoptions are configured, receipt of malformed |
| CVE-2025-21599 | 7.5 HIGH | Junos OS Evolved: Receipt of specifically malformed IPv6 packets causes kernel memory exha |
| CVE-2025-21600 | 6.5 MEDIUM | Junos OS and Junos OS Evolved: With certain BGP options enabled, receipt of specifically m |
| CVE-2025-21602 | 6.5 MEDIUM | Junos OS and Junos OS Evolved: Receipt of specially crafted BGP update packet causes RPD c |
| CVE-2025-21593 | 6.5 MEDIUM | Junos OS and Junos OS Evolved: On SRv6 enabled devices, an attacker sending a malformed BG |
| CVE-2025-21592 | 5.5 MEDIUM | Junos OS: SRX Series: Low privileged user able to access highly sensitive information on f |
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V. Comments for CVE-2025-21596
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