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CVE-2025-21599— Junos OS Evolved: Receipt of specifically malformed IPv6 packets causes kernel memory exhaustion leading to Denial of Service

Quick assessment

Affected
Juniper Networks Junos OS Evolved
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 Evolved是美国瞻博网络（Juniper Networks）公司的Junos OS 的升级版系统。 Juniper Networks Junos OS Evolved存在安全漏洞，该漏洞源于处理特定畸形IPv6数据包时未释放内核内存，导致内存耗尽和系统崩溃，从而造成拒绝服务。

CVSS 7.5 · High EPSS 0.61% · P47

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service
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I. Basic Information for CVE-2025-21599

Vulnerability Information
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Vulnerability Title
Junos OS Evolved: Receipt of specifically malformed IPv6 packets causes kernel memory exhaustion leading to Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
A Missing Release of Memory after Effective Lifetime vulnerability in the Juniper Tunnel Driver (jtd) of Juniper Networks Junos OS Evolved allows an unauthenticated network-based attacker to cause Denial of Service.  Receipt of specifically malformed IPv6 packets, destined to the device, causes kernel memory to not be freed, resulting in memory exhaustion leading to a system crash and Denial of Service (DoS). Continuous receipt and processing of these packets will continue to exhaust kernel memory, creating a sustained Denial of Service (DoS) condition. This issue only affects systems configured with IPv6. This issue affects Junos OS Evolved:  * from 22.4-EVO before 22.4R3-S5-EVO,  * from 23.2-EVO before 23.2R2-S2-EVO,  * from 23.4-EVO before 23.4R2-S2-EVO,  * from 24.2-EVO before 24.2R1-S2-EVO, 24.2R2-EVO. This issue does not affect Juniper Networks Junos OS Evolved versions prior to 22.4R1-EVO.
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
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS Evolved 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks Junos OS Evolved是美国瞻博网络（Juniper Networks）公司的Junos OS 的升级版系统。 Juniper Networks Junos OS Evolved存在安全漏洞，该漏洞源于处理特定畸形IPv6数据包时未释放内核内存，导致内存耗尽和系统崩溃，从而造成拒绝服务。
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 Evolved 22.4-EVO ~ 22.4R3-S5-EVO -

II. Public POCs for CVE-2025-21599

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III. Intelligence Information for CVE-2025-21599

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Vendor Advisories for CVE-2025-21599 (1)

Same Patch Batch · Juniper Networks · 2025-01-09 · 7 CVEs total

CVE-2025-21598 7.5 HIGH Junos OS and Junos OS Evolved: When BGP traceoptions are configured, receipt of malformed
CVE-2025-21600 6.5 MEDIUM Junos OS and Junos OS Evolved: With certain BGP options enabled, receipt of specifically m
CVE-2025-21602 6.5 MEDIUM Junos OS and Junos OS Evolved: Receipt of specially crafted BGP update packet causes RPD c
CVE-2025-21593 6.5 MEDIUM Junos OS and Junos OS Evolved: On SRv6 enabled devices, an attacker sending a malformed BG
CVE-2025-21596 5.5 MEDIUM Junos OS: SRX1500,SRX4100,SRX4200: Execution of low-privileged CLI command results in chas
CVE-2025-21592 5.5 MEDIUM Junos OS: SRX Series: Low privileged user able to access highly sensitive information on f

IV. Related Vulnerabilities

Same product: Junos OS Evolved
Same vendor: Juniper Networks
Same weakness: CWE-401

V. Comments for CVE-2025-21599

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