SB2025071848 - Improper handling of exceptional conditions in Juniper Junos OS

Security Bulletin ID SB2025071848

CSH Severity

Medium

Patch available

YES

Number of vulnerabilities 1

Exploitation vector Remote access

Highest impact Denial of service

Breakdown by Severity

Low
Medium
High
Critical

Description

This security bulletin contains information about 1 vulnerability.

1) Improper handling of exceptional conditions (CVE-ID: CVE-2025-52948)

CWE-ID: CWE-755 - Improper Handling of Exceptional Conditions

CVSSv4: 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/E:U/U:Green

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.

Remediation

Install update from vendor's website.

References

https://supportportal.juniper.net/s/article/2025-07-Security-Bulletin-Junos-OS-Specific-unknown-traffic-pattern-causes-FPC-and-system-to-crash-when-packet-capturing-is-enabled-CVE-2025-52948