NVD

CVE-2025-52947 Detail

Description

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.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

Nist CVSS score does not match with CNA score

CNA: Juniper Networks, Inc.

CVSS-B 7.1 HIGH

Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/R:A/RE:M/U:Green

CVSS 3.x Severity and Vector Strings:

CNA: Juniper Networks, Inc.

Base Score: 6.5 MEDIUM

Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://supportportal.juniper.net/JSA100051	Juniper Networks, Inc.	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-755	Improper Handling of Exceptional Conditions	Juniper Networks, Inc.

Known Affected Software Configurations Switch to CPE 2.2

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Change History

4 change records found show changes

Initial Analysis by NIST 1/23/2026 2:36:17 PM

Action

Type

Old Value

New Value

Added

CPE Configuration

AND
     OR
          *cpe:2.3:o:juniper:junos:21.2:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:-:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r1-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r2-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r2-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r3:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r3-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r3-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r3-s3:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* versions up to (excluding) 21.2
          *cpe:2.3:o:juniper:junos:21.2:r3-s4:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r3-s5:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r3-s6:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r3-s7:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r3-s8:*:*:*:*:*:*
     OR
          cpe:2.3:h:juniper:acx1000:-:*:*:*:*:*:*:*
          cpe:2.3:h:juniper:acx1100:-:*:*:*:*:*:*:*
          cpe:2.3:h:juniper:acx2000:-:*:*:*:*:*:*:*
          cpe:2.3:h:juniper:acx2100:-:*:*:*:*:*:*:*
          cpe:2.3:h:juniper:acx2200:-:*:*:*:*:*:*:*
          cpe:2.3:h:juniper:acx4000:-:*:*:*:*:*:*:*
          cpe:2.3:h:juniper:acx5048:-:*:*:*:*:*:*:*
          cpe:2.3:h:juniper:acx5096:-:*:*:*:*:*:*:*

Added

Reference Type

Juniper Networks, Inc.: https://supportportal.juniper.net/JSA100051 Types: Vendor Advisory

New CVE Received from Juniper Networks, Inc. 7/11/2025 11:15:25 AM

Action	Type	New Value
Added	Description	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.
Added	CVSS V4.0	AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:A/V:X/RE:M/U:Green
Added	CVSS V3.1	AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Added	CWE	CWE-755
Added	Reference	https://supportportal.juniper.net/JSA100051

Quick Info

CVE Dictionary Entry:
CVE-2025-52947
NVD Published Date:
07/11/2025
NVD Last Modified:
06/17/2026
Source:
Juniper Networks, Inc.

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