#VU102488 Improper handling of exceptional conditions in Juniper Junos OS - CVE-2025-21596
Vulnerability identifier: #VU102488
Vulnerability 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:
CWE-ID:
CWE-755
Exploitation vector: Local
Exploit availability: No
Vulnerable software:
Juniper Junos OS
Operating systems & Components /
Operating system
Vendor: Juniper Networks, Inc.
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, 21.4R1-S2, 21.4R2-S1, 21.4R2-S2, 21.4R3-S1, 21.4R3-S2, 21.4R3-S3, 21.4R3-S4, 21.4R3-S5, 21.4R3-S6, 21.4R3-S7, 21.4R3-S7.9, 21.4R3-S8, 21.4R1, 21.4R2, 21.4R3, 22.1R1-S1, 22.1R1-S2, 22.1R2-S1, 22.1R2-S2, 22.1R3-J1, 22.1R3-S1, 22.1R3-S2, 22.1R3-S3, 22.1R3-S4, 22.1R3-S5, 22.1R3-S5.3, 22.1R3-S6, 22.1R1, 22.1R2, 22.1R3, 22.2R1-S1, 22.2R1-S2, 22.2R2-S1, 22.2R2-S2, 22.2R3-S1, 22.2R3-S2, 22.2R3-S3, 22.2R3-S4, 22.2R3-S4.11, 22.2R1, 22.2R2, 22.2R3, 22.3R1-S1, 22.3R1-S2, 22.3R2-S1, 22.3R2-S2, 22.3R3-S1, 22.3R3-S2, 22.3R3-S3, 22.3R1, 22.3R2, 22.3R3, 22.4R1-S1, 22.4R1-S2, 22.4R2-S1, 22.4R2-S2, 22.4R3-S1, 22.4R3-S2, 22.4R3-S3, 22.4R1, 22.4R2, 22.4R3, 23.2R1-S1, 23.2R1-S2, 23.2R2-S1, 23.2R2-S2, 23.2R1, 23.2R2, 23.3R1, 23.4R1-S1, 23.4R1-S2, 23.4R1, 23.4R2, 24.1R1
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.
