CVE-2025-52947

EUVD-2025-21140
An Improper Handling of Exceptional Conditions vulnerability in route processing of Juniper Networks Junos OS on specific end-of-life (EOL) ACX Series platforms allows an attacker to crash the Forwarding Engine Board (FEB) by flapping an interface, leading to a Denial of Service (DoS).

On ACX1000, ACX1100, ACX2000, ACX2100, ACX2200, ACX4000, ACX5048, and ACX5096 devices, FEB0 will crash when the primary path port of the L2 circuit IGP (Interior Gateway Protocol) on the local device goes down. This issue is seen only when 'hot-standby' mode is configured for the L2 circuit.

This issue affects Junos OS on ACX1000, ACX1100, ACX2000, ACX2100, ACX2200, ACX4000, ACX5048, and ACX5096: 



  *  all versions before 21.2R3-S9.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
6.5 MEDIUM
ADJACENT_NETWORK
LOW
NONE
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
juniperCNA
6.5 MEDIUM
ADJACENT_NETWORK
LOW
NONE
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 9%
Affected Products (NVD)
VendorProductVersion
juniperjunos
𝑥
< 21.2
juniperjunos
21.2
juniperjunos
21.2:r1
juniperjunos
21.2:r1-s1
juniperjunos
21.2:r1-s2
juniperjunos
21.2:r2
juniperjunos
21.2:r2-s1
juniperjunos
21.2:r2-s2
juniperjunos
21.2:r3
juniperjunos
21.2:r3-s1
juniperjunos
21.2:r3-s2
juniperjunos
21.2:r3-s3
juniperjunos
21.2:r3-s4
juniperjunos
21.2:r3-s5
juniperjunos
21.2:r3-s6
juniperjunos
21.2:r3-s7
juniperjunos
21.2:r3-s8
𝑥
= Vulnerable software versions