Main Vulnerability Database Vulnerabilities #VU113068

Use-after-free in Junos OS and Junos OS Evolved - CVE-2025-52946

Published: July 18, 2025

Vulnerability identifier: #VU113068

CSH Severity: Medium

CVSS v4: 8.7 [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]

CVE-ID: CVE-2025-52946

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

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.

Affected software

Junos OS
Junos OS Evolved

How to mitigate CVE-2025-52946

Install updates from vendor's website.

Junos OS - addressed in versions 21.2R3-S9, 22.2R3-S6, 22.4R3-S5, 23.2R2-S3, 23.4R2-S4, 24.2R2, 24.4R1
Junos OS Evolved - addressed in versions 22.4R3-S5-EVO, 23.2R2-S3-EVO, 23.4R2-S4-EVO, 24.2R2-EVO, 24.4R1-EVO

External References

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

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