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.

Metrics

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact None

Subsequent System Availability Impact High

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.0002.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Juniper Networks Subscribe
Junos Os Subscribe
Junos Os Evolved Subscribe

No data.

No data.

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Vendors Products
Juniper Networks Subscribe
Junos Os Subscribe
Junos Os Evolved Subscribe
Advisories

No advisories yet.

Fixes

Solution

The following software releases have been updated to resolve this specific issue: Junos OS 21.2R3-S10, 21.4R3-S12, 22.4R3-S8, 23.2R2-S5, 23.4R2-S6, 24.2R2-S2, 24.4R2, 25.2R1-S1, 25.2R2, 25.4R1, and all subsequent releases. Junos OS Evolved 21.4R3-S12-EVO, 22.4R3-S8-EVO, 23.2R2-S5-EVO, 23.4R2-S6-EVO, 24.2R2-S2-EVO, 24.4R2-EVO, 25.2R1-S1-EVO, 25.2R2-EVO, 25.4R1-EVO, and all subsequent releases.

Workaround

There are no known workarounds for this issue.

References
Link Providers
https://kb.juniper.net/JSA103149 cve-icon cve-icon
https://supportportal.juniper.net/ cve-icon cve-icon
History

Fri, 16 Jan 2026 17:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Fri, 16 Jan 2026 14:15:00 +0000

Type Values Removed Values Added
First Time appeared Juniper Networks
Juniper Networks junos Os
Juniper Networks junos Os Evolved
Vendors & Products Juniper Networks
Juniper Networks junos Os
Juniper Networks junos Os Evolved

Thu, 15 Jan 2026 20:30:00 +0000

Type Values Removed Values Added
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.
Title Junos OS and Junos OS Evolved: DHCP Option 82 messages from clients being passed unmodified to the DHCP server
Weaknesses CWE-754
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H'}

cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:N/SA:H/AU:Y/R:U/V:C/RE:M/U:Amber'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: juniper

Published:

Updated: 2026-01-16T16:27:58.152Z

Reserved: 2025-09-23T18:19:06.954Z

Link: CVE-2025-59960

cve-icon Vulnrichment

Updated: 2026-01-16T16:27:54.742Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-01-15T21:16:03.213

Modified: 2026-01-16T15:55:12.257

Link: CVE-2025-59960

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-01-16T13:43:15Z

Weaknesses