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CVE-2025-21601— Junos OS: SRX and EX Series, MX240, MX480, MX960, QFX5120 Series: When web management is enabled for specific services an attacker may cause a CPU spike by sending genuine packets to the device

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web管理规范遵循不当，可能导致拒绝服务。

CVSS 7.5 · High EPSS 0.40% · P33
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I. Basic Information for CVE-2025-21601

Vulnerability Information
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Vulnerability Title
Junos OS: SRX and EX Series, MX240, MX480, MX960, QFX5120 Series: When web management is enabled for specific services an attacker may cause a CPU spike by sending genuine packets to the device
Source: CVE Program / CVE List V5
Vulnerability Description
An Improper Following of Specification by Caller vulnerability in web management (J-Web, Captive Portal, 802.1X, Juniper Secure Connect (JSC) of Juniper Networks Junos OS on SRX Series, EX Series, MX240, MX480, MX960, QFX5120 Series, allows an unauthenticated, network-based attacker, sending genuine traffic targeted to the device to cause the CPU to climb until the device becomes unresponsive. Continuous receipt of these packets will create a sustained Denial of Service (DoS) condition. This issue affects Junos OS:  * All versions before 21.4R3-S9, * from 22.2 before 22.2R3-S5, * from 22.4 before 22.4R3-S4, * from 23.2 before 23.2R2-S3, * from 23.4 before 23.4R2-S3, * from 24.2 before 24.2R1-S1, 24.2R2. An indicator of compromise is to review the CPU % of the httpd process in the CLI: e.g.   show system processes extensive | match httpd  PID nobody       52   0   20M    191M select   2   0:01   80.00% httpd{httpd} <<<<< the percentage of httpd usage if high may be an indicator
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
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web管理规范遵循不当，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 ~ 21.4R3-S9 -

II. Public POCs for CVE-2025-21601

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III. Intelligence Information for CVE-2025-21601

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Same Patch Batch · Juniper Networks · 2025-04-09 · 21 CVEs total

CVE-2025-30659 7.5 HIGH Junos OS: SRX Series: A device configured for vector routing crashes when receiving malfor
CVE-2025-21594 7.5 HIGH Junos OS: MX Series: In DS-lite and NAT scenario receipt of crafted IPv6 traffic causes po
CVE-2025-30644 7.5 HIGH Junos OS: EX2300, EX3400, EX4000 Series, QFX5k Series: Receipt of a specific DHCP packet c
CVE-2025-30645 7.5 HIGH Junos OS: SRX Series: Transmission of specific control traffic sent out of a DS-Lite tunne
CVE-2025-30649 7.5 HIGH Junos OS: MX240, MX480, MX960 with SPC3: An attacker sending specific packets will cause a
CVE-2025-30651 7.5 HIGH Junos OS and Junos OS Evolved: Receipt of a specific ICMPv6 packet causes a memory overrun
CVE-2025-30656 7.5 HIGH Junos OS: MX Series, SRX Series: Processing of specific SIP INVITE messages by the SIP ALG
CVE-2025-30658 7.5 HIGH Junos OS: SRX Series: On devices with Anti-Virus enabled, malicious server responses will
CVE-2025-30660 7.5 HIGH Junos OS: MX Series: Decapsulation of specific GRE packets leads to PFE reset
CVE-2025-30648 7.4 HIGH Junos OS and Junos OS Evolved: Receipt of a specifically malformed DHCP packet causes jdhc
CVE-2025-21591 7.4 HIGH Junos OS: An unauthenticated adjacent attacker sending a malformed DHCP packet causes jdhc
CVE-2025-30653 6.5 MEDIUM Junos OS and Junos OS Evolved: LSP flap in a specific MPLS scenario leads to rpd crash
CVE-2025-30647 6.5 MEDIUM Junos OS: MX Series: Subscriber login/logout activity will lead to a memory leak
CVE-2025-30646 6.5 MEDIUM Junos OS and Junos OS Evolved: Receipt of a malformed LLDP TLV results in l2cpd crash
CVE-2025-21595 6.5 MEDIUM Junos OS and Junos OS Evolved: In an EVPN-VXLAN scenario specific ARP or NDP packets cause
CVE-2025-30654 5.5 MEDIUM Junos OS and Junos OS Evolved: A local, low privileged user can access sensitive informati
CVE-2025-30652 5.5 MEDIUM Junos OS and Junos OS Evolved: Executing a specific CLI command when asregex-optimized is
CVE-2025-30655 5.5 MEDIUM Junos OS and Junos OS Evolved: A specific CLI command will cause an RPD crash when rib-sha
CVE-2025-30657 5.3 MEDIUM Junos OS: Processing of a specific BGP update causes the SRRD process to crash
CVE-2025-21597 5.3 MEDIUM Junos OS and Junos OS Evolved: When BGP rib-sharding and update-threading are configured a

IV. Related Vulnerabilities

Same product: Junos OS
Same vendor: Juniper Networks

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