Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1000 CNY

100.0%
Buy Us a Coffee

CVE-2026-21906— Junos OS: SRX Series: With GRE performance acceleration enabled, receipt of a specific ICMP packet causes the PFE to crash

CVSS 7.5 · High EPSS 0.02% · P5
Get alerts for future matching vulnerabilitiesLog in to subscribe

I. Basic Information for CVE-2026-21906

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Junos OS: SRX Series: With GRE performance acceleration enabled, receipt of a specific ICMP packet causes the PFE to crash
Source: NVD (National Vulnerability Database)
Vulnerability Description
An Improper Handling of Exceptional Conditions vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on SRX Series allows an unauthenticated network-based attacker sending a specific ICMP packet through a GRE tunnel to cause the PFE to crash and restart. When PowerMode IPsec (PMI) and GRE performance acceleration are enabled and the device receives a specific ICMP packet, a crash occurs in the SRX PFE, resulting in traffic loss. PMI is enabled by default, and GRE performance acceleration can be enabled by running the configuration command shown below. PMI is a mode of operation that provides IPsec performance improvements using Vector Packet Processing. Note that PMI with GRE performance acceleration is only supported on specific SRX platforms. This issue affects Junos OS on the SRX Series: * all versions before 21.4R3-S12,  * from 22.4 before 22.4R3-S8,  * from 23.2 before 23.2R2-S5,  * from 23.4 before 23.4R2-S5,  * from 24.2 before 24.2R2-S3,  * from 24.4 before 24.4R2-S1,  * from 25.2 before 25.2R1-S1, 25.2R2.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/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 21.4R3-S12之前版本、22.4R3-S8之前版本、23.2R2-S5之前版本、23.4R2-S5之前版本、24.2R2-S3之前版本、24.4R2-S1之前版本、25.2R1-S1和25.2R2之前版本存在安全漏洞，该漏洞源于数据包转发引擎异常条件处
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 ~ 21.4R3-S12 -

II. Public POCs for CVE-2026-21906

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-21906

请登录查看更多情报信息。

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-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-2026-02036.5 MEDIUMJunos OS: Receipt of a specifically malformed ICMP packet causes an FPC restart
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-2026-21906

No comments yet

Leave a comment