CVE-2025-59960— Junos OS and Junos OS Evolved: DHCP Option 82 messages from clients being passed unmodified to the DHCP server
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和Juniper Networks Junos OS Evolved都是美国瞻博网络（Juniper Networks）公司的产品。Juniper Networks Junos OS是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 Evolved是Junos OS 的升级版系统。 Juniper Networks Junos OS和Juniper Network
Possible ATT&CK Techniques 2 AI
T1190 · Exploit Public-Facing Application T1498.002 · Reflection Amplification
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I. Basic Information for CVE-2025-59960
Vulnerability Information
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Vulnerability Title
Junos OS and Junos OS Evolved: DHCP Option 82 messages from clients being passed unmodified to the DHCP server
Source: CVE Program / CVE List V5
Vulnerability Description
An Improper Check for Unusual or Exceptional Conditions vulnerability in the Juniper DHCP service (jdhcpd) of Juniper Networks Junos OS and Junos OS Evolved allows a DHCP client in one subnet to exhaust the address pools of other subnets, leading to a Denial of Service (DoS) on the downstream DHCP server.
By default, the DHCP relay agent inserts its own Option 82 information when forwarding client requests, optionally replacing any Option 82 information provided by the client. When a specific DHCP DISCOVER is received in 'forward-only' mode with Option 82, the device should drop the message unless 'trust-option82' is configured. Instead, the DHCP relay forwards these packets to the DHCP server unmodified, which uses up addresses in the DHCP server's address pool, ultimately leading to address pool exhaustion.
This issue affects Junos OS:
* all versions before 21.2R3-S10,
* from 21.4 before 21.4R3-S12,
* all versions of 22.2,
* from 22.4 before 22.4R3-S8,
* from 23.2 before 23.2R2-S5,
* from 23.4 before 23.4R2-S6,
* from 24.2 before 24.2R2-S2,
* from 24.4 before 24.4R2,
* from 25.2 before 25.2R1-S1, 25.2R2.
Junos OS Evolved:
* all versions before 21.4R3-S12-EVO,
* all versions of 22.2-EVO,
* from 22.4 before 22.4R3-S8-EVO,
* from 23.2 before 23.2R2-S5-EVO,
* from 23.4 before 23.4R2-S6-EVO,
* from 24.2 before 24.2R2-S2-EVO,
* from 24.4 before 24.4R2-EVO,
* from 25.2 before 25.2R1-S1-EVO, 25.2R2-EVO.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对因果或异常条件的不恰当检查
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS和Juniper Networks Junos OS Evolved 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks Junos OS和Juniper Networks Junos OS Evolved都是美国瞻博网络（Juniper Networks）公司的产品。Juniper Networks Junos OS是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 Evolved是Junos OS 的升级版系统。 Juniper Networks Junos OS和Juniper Network
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-S10 | - |
|
| Juniper Networks | Junos OS Evolved | 0 ~ 21.4R3-S12-EVO | - |
|
II. Public POCs for CVE-2025-59960
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2025-59960 (1)
Same Patch Batch · Juniper Networks · 2026-01-15 · 23 CVEs total
| CVE-2026-21920 | 7.5 HIGH | Junos OS: SRX Series: If a specific request is processed by the DNS subsystem flowd will c |
| CVE-2026-21918 | 7.5 HIGH | Junos OS: SRX and MX Series: When TCP packets occur in a specific sequence flowd crashes |
| CVE-2025-60003 | 7.5 HIGH | Junos OS and Junos OS Evolved: BGP update with a set of specific attributes causes rpd cra |
| CVE-2026-21917 | 7.5 HIGH | Junos OS: SRX Series: Specifically malformed SSL packet causes FPC crash |
| CVE-2026-21914 | 7.5 HIGH | Junos OS: SRX Series: A specifically malformed GTP message will cause an FPC crash |
| CVE-2026-21913 | 7.5 HIGH | Junos OS: EX4000: A high volume of traffic destined to the device leads to a crash and res |
| CVE-2026-21905 | 7.5 HIGH | Junos OS: SRX Series, MX Series with MX-SPC3 or MS-MPC: Receipt of multiple specific SIP m |
| CVE-2026-21906 | 7.5 HIGH | Junos OS: SRX Series: With GRE performance acceleration enabled, receipt of a specific ICM |
| CVE-2026-21908 | 7.1 HIGH | Junos OS and Junos OS Evolved: Use after free vulnerability In 802.1X authentication daemo |
| CVE-2026-21921 | 6.5 MEDIUM | Junos OS and Junos OS Evolved: When telemetry collectors are frequently subscribing and un |
| CVE-2026-21911 | 6.5 MEDIUM | Junos OS Evolved: Flapping management interface causes MAC learning on label-switched inte |
| CVE-2026-21910 | 6.5 MEDIUM | Junos OS: EX4k Series, QFX5k Series: In an EVPN-VXLAN configuration link flaps cause Inter |
| CVE-2026-21909 | 6.5 MEDIUM | Junos OS and Junos OS Evolved: Receipt of specific IS-IS update packet causes memory leak |
| CVE-2026-21903 | 6.5 MEDIUM | Junos OS: Subscribing to telemetry sensors at scale causes all FPCs to crash |
| CVE-2026-0203 | 6.5 MEDIUM | Junos OS: Receipt of a specifically malformed ICMP packet causes an FPC restart |
| CVE-2025-52987 | 6.1 MEDIUM | Paragon Automation: A clickjacking vulnerability in the web server configuration has been |
| CVE-2026-21907 | 5.9 MEDIUM | Junos Space: TLS/SSL server supports use of static key ciphers (ssl-static-key-ciphers) |
| CVE-2025-60011 | 5.8 MEDIUM | Junos OS and Junos OS Evolved: Optional transitive BGP attribute is modified before propag |
| CVE-2026-21912 | 5.5 MEDIUM | Junos OS: MX10k Series: 'show system firmware' CLI command may lead to LC480 or LC2101 lin |
| CVE-2025-60007 | 5.5 MEDIUM | Junos OS: A specifically crafted 'show chassis' command causes chassisd to crash |
Showing top 20 of 23 CVEs. View all on vendor page → →
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V. Comments for CVE-2025-59960
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