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

1) Use-after-free

EUVDB-ID: #VU113068

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-2025-52946

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to crash the system.

The vulnerability exists due to a use-after-free error in the routing protocol daemon (rpd). A remote attacker can send a BGP update with a specifically malformed AS PATH to cause rpd to crash. 

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: before 21.2R3-S9, 22.2R3-S6, 22.4R3-S5, 23.2R2-S3, 23.4R2-S4, 24.2R2, 24.4R1

Junos OS Evolved: before 22.4R3-S5-EVO, 23.2R2-S3-EVO, 23.4R2-S4-EVO, 24.2R2-EVO, 24.4R1-EVO

CPE2.3

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

External links

https://supportportal.juniper.net/s/article/2025-07-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-With-traceoptions-enabled-receipt-of-malformed-AS-PATH-causes-RPD-crash-CVE-2025-52946

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.