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CVE-2025-52947— Junos OS: ACX Series: When 'hot-standby' mode is configured for an L2 circuit, interface flap causes the FEB to crash

Quick assessment

Affected
Juniper Networks Junos OS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Juniper Networks Junos OS是美国瞻博网络（Juniper Networks）公司的一套专用于该公司的硬件设备的网络操作系统。该操作系统提供了安全编程接口和Junos SDK。 Juniper Networks Junos OS存在安全漏洞，该漏洞源于路由处理异常条件不当，可能导致拒绝服务。

CVSS 6.5 · Medium EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-52947

Vulnerability Information
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Vulnerability Title
Junos OS: ACX Series: When 'hot-standby' mode is configured for an L2 circuit, interface flap causes the FEB to crash
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对异常条件的处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks Junos OS是美国瞻博网络（Juniper Networks）公司的一套专用于该公司的硬件设备的网络操作系统。该操作系统提供了安全编程接口和Junos SDK。 Juniper Networks Junos OS存在安全漏洞，该漏洞源于路由处理异常条件不当，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Juniper Networks Junos OS 0 ~ 21.2R3-S9 -

II. Public POCs for CVE-2025-52947

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III. Intelligence Information for CVE-2025-52947

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Same Patch Batch · Juniper Networks · 2025-07-11 · 24 CVEs total

CVE-2025-52950 9.6 CRITICAL Juniper Security Director: Insufficient authorization for multiple endpoints in web interf
CVE-2025-52954 7.8 HIGH Junos OS Evolved: A low-privileged user can execute arbitrary Junos commands and modify th
CVE-2025-52946 7.5 HIGH Junos OS and Junos OS Evolved: With traceoptions enabled, receipt of malformed AS PATH cau
CVE-2025-52981 7.5 HIGH Junos OS: SRX Series: Sequence of specific PIM packets causes a flowd crash
CVE-2025-52980 7.5 HIGH Junos OS: SRX300 Series: rpd will crash upon receiving a specific, valid BGP UPDATE messag
CVE-2025-30661 7.3 HIGH Junos OS: Low-privileged user can cause script to run as root, leading to privilege escala
CVE-2025-52983 7.2 HIGH Junos OS: After removing ssh public key authentication root can still log in
CVE-2025-52988 6.7 MEDIUM Junos OS and Junos OS Evolved: Privilege escalation to root via CLI command 'request syste
CVE-2025-6549 6.5 MEDIUM Junos OS: SRX Series: J-Web can be exposed on additional interfaces
CVE-2025-52949 6.5 MEDIUM Junos OS and Junos OS Evolved: In an EVPN environment, receipt of specifically malformed B
CVE-2025-52955 6.5 MEDIUM Junos OS and Junos OS Evolved: When jflow/sflow is configured continuous logical interface
CVE-2025-52952 6.5 MEDIUM Junos OS: MX Series with MPC-BUILTIN, MPC 1 through MPC 9: Receipt and processing of a mal
CVE-2025-52953 6.5 MEDIUM Junos OS and Junos OS Evolved: An unauthenticated adjacent attacker sending a valid BGP UP
CVE-2025-52964 6.5 MEDIUM Junos OS and Junos OS Evolved: Receipt of a specific BGP UPDATE causes an rpd crash on dev
CVE-2025-52982 5.9 MEDIUM Junos OS: MX Series: When specific SIP packets are processed the MS-MPC will crash
CVE-2025-52984 5.9 MEDIUM Junos OS and Junos OS Evolved: When a static route points to a reject next-hop and a gNMI
CVE-2025-52948 5.9 MEDIUM Junos OS: Specific unknown traffic pattern causes FPC and system to crash when packet capt
CVE-2025-52951 5.8 MEDIUM Junos OS: IPv6 firewall filter fails to match payload-protocol
CVE-2025-52963 5.5 MEDIUM Junos OS: A low-privileged user can disable an interface
CVE-2025-52986 5.5 MEDIUM Junos OS and Junos OS Evolved: When RIB sharding is configured each time a show command is

Showing top 20 of 24 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Junos OS
Same vendor: Juniper Networks
Same weakness: CWE-755

V. Comments for CVE-2025-52947

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