Vulnerability identifier: #VU102533

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2025-21600

CWE-ID: CWE-125

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Juniper Junos OS
Operating systems & Components / Operating system
Junos OS Evolved
Operating systems & Components / Operating system

Vendor: Juniper Networks, Inc.

Description

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

The vulnerability exists due to a boundary condition in the routing protocol daemon (rpd). A remote attacker on the local network can send a specially crafted BPG packet and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 21.1R1-S1 - 21.1, 21.2R1-S1 - 21.2R3, 21.3R1-S1 - 21.3R3, 21.4R1-S1 - 21.4R3, 22.1R1-S1 - 22.1R3, 22.2R1-S1 - 22.2R3, 22.3R1-S1 - 22.3R3, 22.4R1-S1 - 22.4R3, 23.1R1-S1 - 23.1R2, 23.3R1, 23.4R1-S1 - 23.4R1, 23.4R2-S1 - 23.4R2, 24.1R1, 24.2R1-S1 - 24.2R1

Junos OS Evolved: 21.1-EVO - 21.1, 21.2-EVO - 21.2R3-S8-EVO, 21.3-EVO - 21.3R3-S5-EVO, 21.4R1-EVO - 21.4R3-S8-EVO, 22.1-EVO - 22.1R3-S6-EVO, 22.2-EVO - 22.2R3-S4-EVO, 22.3R1-EVO - 22.3R3-S3-EVO, 22.4R1-EVO - 22.4R3-S4-EVO, 23.1R1-EVO - 23.1R2-EVO, 23.2R1-EVO - 23.2R2-S2-EVO, 23.3R1-EVO - 23.3R3-EVO, 23.4R1-EVO - 23.4R2-S1-EVO, 24.1R1-EVO, 24.2R1-EVO - 24.2R1-S1-EVO

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External links
http://supportportal.juniper.net/s/article/2025-01-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-With-certain-BGP-options-enabled-receipt-of-specifically-malformed-BGP-update-causes-RPD-crash-CVE-2025-21600

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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