Improper handling of exceptional conditions in Juniper Junos OS

1) Improper handling of exceptional conditions

EUVDB-ID: #VU102488

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-21596

CWE-ID: CWE-755 - Improper Handling of Exceptional Conditions

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper handling of exceptional conditions error in the command-line processing. A local user can cause the chassis daemon (chassisd) to crash and restart, resulting in a temporary Denial of Service (DoS).

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 21.4R1-S1 - 24.1R1

CPE2.3

• cpe:2.3:o:juniper_networks:juniper_junos_os:21.4R3:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:22.1R3:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:22.2R3:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:22.3R3:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:22.4R3:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:23.2R2:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:23.3R1:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:23.4R1:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:23.4R2:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:24.1R1:*:*:*:*:*:*:*

External links

https://supportportal.juniper.net/s/article/2025-01-Security-Bulletin-Junos-OS-SRX1500-SRX4100-SRX4200-Execution-of-low-privileged-CLI-command-results-in-chassisd-crash-CVE-2025-21596

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.