Remote denial of service in Junos OS and Junos OS Evolved rpd

1) Out-of-bounds read

EUVDB-ID: #VU102530

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-21598

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition in routing protocol daemon (rpd). A remote attacker can send malformed BGP packets to the affected device, trigger an out-of-bounds read error and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 21.2R3-S8 - 24.2R1

Junos OS Evolved: 21.4R3-S7-EVO - 24.2R1-S1-EVO

CPE2.3

• cpe:2.3:o:juniper_networks:juniper_junos_os:21.2R3-S8:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:21.4R3-S8:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:22.2R3-S4:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:22.3R3-S3:*:*:*:*:*:*:*
• 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:23.4R1:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:23.4R2:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:juniper_junos_os:24.2R1:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:junos_os_evolved:21.4R3-S8-EVO:*:*:*:*:*:*:*

External links

https://supportportal.juniper.net/s/article/2025-01-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-When-BGP-traceoptions-are-configured-receipt-of-malformed-BGP-packets-causes-RPD-to-crash-CVE-2025-21598

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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