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CVE-2026-0203— Junos OS: Receipt of a specifically malformed ICMP packet causes an FPC restart

CVSS 6.5 · Medium EPSS 0.01% · P1
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I. Basic Information for CVE-2026-0203

Vulnerability Information
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Vulnerability Title
Junos OS: Receipt of a specifically malformed ICMP packet causes an FPC restart
Source: NVD (National Vulnerability Database)
Vulnerability Description
An Improper Handling of Exceptional Conditions vulnerability in packet processing of Juniper Networks Junos OS allows an unauthenticated, network-adjacent attacker sending a specifically malformed ICMP packet to cause an FPC to crash and restart, resulting in a Denial of Service (DoS). When an ICMP packet is received with a specifically malformed IP header value, the FPC receiving the packet crashes and restarts. Due to the specific type of malformed packet, adjacent upstream routers would not forward the packet, limiting the attack surface to adjacent networks. This issue only affects ICMPv4. ICMPv6 is not vulnerable to this issue. This issue does not affect AFT-based line cards such as the MPC10, MPC11, LC4800, LC9600, and MX304. This issue affects Junos OS:  * all versions before 21.2R3-S9,  * from 21.4 before 21.4R3-S10,  * from 22.2 before 22.2R3-S7,  * from 22.3 before 22.3R3-S4,  * from 22.4 before 22.4R3-S5,  * from 23.2 before 23.2R2-S3,  * from 23.4 before 23.4R2-S3,  * from 24.2 before 24.2R1-S2, 24.2R2.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
对异常条件的处理不恰当
Source: NVD (National Vulnerability Database)
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 21.2R3-S9之前版本、21.4版本至21.4R3-S10之前版本、22.2版本至22.2R3-S7之前版本、22.3版本至22.3R3-S4之前版本、22.4版本至22.4R3-S5之前版本、23.2版本至23.2R2-S3之前版本、23.4版本至23
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

VendorProductAffected VersionsCPESubscribe
Juniper NetworksJunos OS 0 ~ 21.2R3-S9 -

II. Public POCs for CVE-2026-0203

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III. Intelligence Information for CVE-2026-0203

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Same Patch Batch · Juniper Networks · 2026-01-15 · 23 CVEs total

CVE-2026-219207.5 HIGHJunos OS: SRX Series: If a specific request is processed by the DNS subsystem flowd will c
CVE-2026-219187.5 HIGHJunos OS: SRX and MX Series: When TCP packets occur in a specific sequence flowd crashes
CVE-2025-600037.5 HIGHJunos OS and Junos OS Evolved: BGP update with a set of specific attributes causes rpd cra
CVE-2026-219177.5 HIGHJunos OS: SRX Series: Specifically malformed SSL packet causes FPC crash
CVE-2026-219147.5 HIGHJunos OS: SRX Series: A specifically malformed GTP message will cause an FPC crash
CVE-2026-219137.5 HIGHJunos OS: EX4000: A high volume of traffic destined to the device leads to a crash and res
CVE-2026-219057.5 HIGHJunos OS: SRX Series, MX Series with MX-SPC3 or MS-MPC: Receipt of multiple specific SIP m
CVE-2026-219067.5 HIGHJunos OS: SRX Series: With GRE performance acceleration enabled, receipt of a specific ICM
CVE-2025-599607.4 HIGHJunos OS and Junos OS Evolved: DHCP Option 82 messages from clients being passed unmodifie
CVE-2026-219087.1 HIGHJunos OS and Junos OS Evolved: Use after free vulnerability In 802.1X authentication daemo
CVE-2026-219216.5 MEDIUMJunos OS and Junos OS Evolved: When telemetry collectors are frequently subscribing and un
CVE-2026-219116.5 MEDIUMJunos OS Evolved: Flapping management interface causes MAC learning on label-switched inte
CVE-2026-219106.5 MEDIUMJunos OS: EX4k Series, QFX5k Series: In an EVPN-VXLAN configuration link flaps cause Inter
CVE-2026-219096.5 MEDIUMJunos OS and Junos OS Evolved: Receipt of specific IS-IS update packet causes memory leak
CVE-2026-219036.5 MEDIUMJunos OS: Subscribing to telemetry sensors at scale causes all FPCs to crash
CVE-2025-529876.1 MEDIUMParagon Automation: A clickjacking vulnerability in the web server configuration has been
CVE-2026-219075.9 MEDIUMJunos Space: TLS/SSL server supports use of static key ciphers (ssl-static-key-ciphers)
CVE-2025-600115.8 MEDIUMJunos OS and Junos OS Evolved: Optional transitive BGP attribute is modified before propag
CVE-2026-219125.5 MEDIUMJunos OS: MX10k Series: 'show system firmware' CLI command may lead to LC480 or LC2101 lin
CVE-2025-600075.5 MEDIUMJunos OS: A specifically crafted 'show chassis' command causes chassisd to crash

Showing top 20 of 23 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-2026-0203

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