Improper check for unusual or exceptional conditions in Junos OS Evolved and Juniper Junos OS

1) Improper check for unusual or exceptional conditions

EUVDB-ID: #VU107616

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-2025-30655

CWE-ID: CWE-754 - Improper Check for Unusual or 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 check for unusual or exceptional conditions error in the Routing Protocol Daemon (rpd). A local user can cause a Denial-of-Service (DoS).

When a specific "show bgp neighbor" CLI command is run, the rpd cpu utilization rises and eventually causes a crash and restart.

Repeated use of this command will cause a sustained DoS condition.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Junos OS Evolved: before 21.2R3-S9-EVO, 21.4R3-S8-EVO, 21.2R3-S9-EVO

Juniper Junos OS: before 21.2R3-S9, 21.4R3-S8, 21.2R3-S9

CPE2.3

• cpe:2.3:o:juniper_networks:junos_os_evolved:*:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:*:*:*:*:*:*:*:*

External links

https://supportportal.juniper.net/s/article/2025-04-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-A-specific-CLI-command-will-cause-a-RPD-crash-when-rib-sharding-and-update-threading-is-enabled-CVE-2025-30655

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.