Improper Handling of Exceptional Conditions in Junos OS on Juniper Networks ACX Series Platforms
CVE-2025-52947

7.1HIGH

Key Information:

Vendor

Juniper Networks
Status
Junos Os
Vendor
CVE Published:
11 July 2025

Badges

👾 Exploit Exists

What is CVE-2025-52947?

A vulnerability in the route processing of Juniper Networks' Junos OS allows attackers to cause a Denial of Service (DoS) on specific end-of-life ACX Series platforms. By flapping an interface while in 'hot-standby' mode, an attacker can trigger a crash of the Forwarding Engine Board (FEB) when the primary path port of the L2 circuit IGP goes down. This issue is present in all versions of the Junos OS prior to 21.2R3-S9, affecting models ACX1000, ACX1100, ACX2000, ACX2100, ACX2200, ACX4000, ACX5048, and ACX5096.

Affected Version(s)

Junos OS ACX1000 0 < 21.2R3-S9

References

https://supportportal.juniper.net/JSA100051
vendor-advisory

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.
CVE-2025-52947 : Improper Handling of Exceptional Conditions in Junos OS on Juniper Networks ACX Series Platforms