Improper handling of exceptional conditions in Junos OS - CVE-2025-52948
Published: July 18, 2025
Vulnerability identifier: #VU113061
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-52948
CWE-ID: CWE-755
Exploitation vector: Remote access
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 exceptional conditions error in Berkeley Packet Filter (BPF) processing. A remote non-authenticated attacker can cause the FPC and system to crash and restart.
BPF provides a raw interface to data link layers in a protocol independent fashion.
Internally within the Junos kernel, due to a rare timing issue (race condition), when a BPF instance is cloned, the newly created interface causes an internal structure leakage, leading to a system crash.
Affected software
Junos OS
How to mitigate CVE-2025-52948
Install updates from vendor's website.
Junos OS - addressed in versions 21.2R3-S9, 21.4R3-S10, 22.2R3-S6, 22.4R3-S7, 23.2R2-S3, 23.4R2-S3, 24.2R1-S1, 24.2R2, 24.4R1