Improper Handling of Length Parameter Inconsistency in Junos OS and Junos OS Evolved - CVE-2025-52949
Published: July 18, 2025
Vulnerability identifier: #VU113052
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-52949
CWE-ID: CWE-130
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to improper handling of length parameter inconsistency error in the routing protocol daemon (rpd). A remote BGP peer can send a specifically malformed BGP packet and cause rpd to crash and restart, resulting in a Denial of Service (DoS).
Affected software
Junos OS
Junos OS Evolved
Junos OS Evolved
How to mitigate CVE-2025-52949
Install updates from vendor's website.
Junos OS - addressed in versions 21.4R3-S11, 22.2R3-S7, 22.4R3-S7, 23.2R2-S4, 23.4R2-S5, 24.2R2-S1, 24.4R1-S3, 24.4R2, 25.2R1
Junos OS Evolved - addressed in versions 22.2R3-S7-EVO, 22.4R3-S7-EVO, 23.2R2-S4-EVO, 23.4R2-S5-EVO, 24.2R2-S1-EVO, 24.4R1-S3-EVO, 24.4R2-EVO, 25.2R1-EVO
Junos OS Evolved - addressed in versions 22.2R3-S7-EVO, 22.4R3-S7-EVO, 23.2R2-S4-EVO, 23.4R2-S5-EVO, 24.2R2-S1-EVO, 24.4R1-S3-EVO, 24.4R2-EVO, 25.2R1-EVO