CVE-2025-59960 (GCVE-0-2025-59960)

Vulnerability from cvelistv5 – Published: 2026-01-15 20:14 – Updated: 2026-01-16 16:27
VLAI
Title
Junos OS and Junos OS Evolved: DHCP Option 82 messages from clients being passed unmodified to the DHCP server
Summary
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.
Severity
7.4 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
6.3 (Medium)
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
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
URL Tags
https://supportportal.juniper.net/ vendor-advisory
https://kb.juniper.net/JSA103149 vendor-advisory
Impacted products
Vendor Product Version
Juniper Networks Junos OS Affected: 0 , < 21.2R3-S10 (semver)
Affected: 21.4 , < 21.4R3-S12 (semver)
Affected: 22.2 , < 22.2* (semver)
Affected: 22.4 , < 22.4R3-S8 (semver)
Affected: 23.2 , < 23.2R2-S5 (semver)
Affected: 23.4 , < 23.4R2-S6 (semver)
Affected: 24.2 , < 24.2R2-S2 (semver)
Affected: 24.4 , < 24.4R2 (semver)
Affected: 25.2 , < 25.2R1-S1, 25.2R2 (semver)
Create a notification for this product.
Juniper Networks Junos OS Evolved Affected: 0 , < 21.4R3-S12-EVO (semver)
Affected: 22.2 , < 22.2* (semver)
Affected: 22.4 , < 22.4R3-S8-EVO (semver)
Affected: 23.2 , < 23.2R2-S5-EVO (semver)
Affected: 23.4 , < 23.4R2-S6-EVO (semver)
Affected: 24.2 , < 24.2R2-S2-EVO (semver)
Affected: 24.4 , < 24.4R2-EVO (semver)
Affected: 25.2 , < 25.2R1-S1-EVO, 25.2R2-EVO (semver)
Create a notification for this product.
Date Public
2026-01-14 17:00
Show details on NVD website
To clipboard 

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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-59960\",\"sourceIdentifier\":\"sirt@juniper.net\",\"published\":\"2026-01-15T21:16:03.213\",\"lastModified\":\"2026-01-23T19:39:11.287\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\\n\\n\\n\\nBy 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 \u0027forward-only\u0027 mode with Option 82, the device should drop the message unless \u0027trust-option82\u0027 is configured. Instead, the DHCP relay forwards these packets to the DHCP server unmodified, which uses up addresses in the DHCP server\u0027s address pool, ultimately leading to address pool exhaustion.\\n\\nThis issue affects Junos OS:\u00a0\\n\\n\\n\\n  *  all versions before 21.2R3-S10,\\n  *  from 21.4 before 21.4R3-S12,\\n  *  all versions of 22.2,\\n  *  from 22.4 before 22.4R3-S8,\u00a0\\n  *  from 23.2 before 23.2R2-S5,\u00a0\\n  *  from 23.4 before 23.4R2-S6,\u00a0\\n  *  from 24.2 before 24.2R2-S2,\u00a0\\n  *  from 24.4 before 24.4R2,\u00a0\\n  *  from 25.2 before 25.2R1-S1, 25.2R2.\\n\\n\\n\\n\\nJunos OS Evolved:\\n\\n\\n\\n  *  all versions before 21.4R3-S12-EVO,\u00a0\\n  *  all versions of 22.2-EVO,\\n  *  from 22.4 before 22.4R3-S8-EVO,\u00a0\\n  *  from 23.2 before 23.2R2-S5-EVO,\u00a0\\n  *  from 23.4 before 23.4R2-S6-EVO,\u00a0\\n  *  from 24.2 before 24.2R2-S2-EVO,\u00a0\\n  *  from 24.4 before 24.4R2-EVO,\u00a0\\n  *  from 25.2 before 25.2R1-S1-EVO, 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Advisory\"]},{\"url\":\"https://supportportal.juniper.net/\",\"source\":\"sirt@juniper.net\",\"tags\":[\"Permissions Required\"]}]}}",
    "vulnrichment": {
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subsequent releases.\\n\\n\\nJunos 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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"The following software releases have been updated to resolve this specific issue: \u003cbr\u003eJunos 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.\u003cbr\u003e\\n\\nJunos 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.\\n\\n\u003cbr\u003e\", \"base64\": false}]}], \"datePublic\": \"2026-01-14T17:00:00.000Z\", \"references\": [{\"url\": \"https://supportportal.juniper.net/\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://kb.juniper.net/JSA103149\", \"tags\": [\"vendor-advisory\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"There are no known workarounds for this issue.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"There are no known workarounds for this issue.\", \"base64\": false}]}], \"x_generator\": {\"engine\": \"Vulnogram 0.1.0-dev\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\\n\\n\\n\\nBy 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 \u0027forward-only\u0027 mode with Option 82, the device should drop the message unless \u0027trust-option82\u0027 is configured. Instead, the DHCP relay forwards these packets to the DHCP server unmodified, which uses up addresses in the DHCP server\u0027s address pool, ultimately leading to address pool exhaustion.\\n\\nThis issue affects Junos OS:\\u00a0\\n\\n\\n\\n  *  all versions before 21.2R3-S10,\\n  *  from 21.4 before 21.4R3-S12,\\n  *  all versions of 22.2,\\n  *  from 22.4 before 22.4R3-S8,\\u00a0\\n  *  from 23.2 before 23.2R2-S5,\\u00a0\\n  *  from 23.4 before 23.4R2-S6,\\u00a0\\n  *  from 24.2 before 24.2R2-S2,\\u00a0\\n  *  from 24.4 before 24.4R2,\\u00a0\\n  *  from 25.2 before 25.2R1-S1, 25.2R2.\\n\\n\\n\\n\\nJunos OS Evolved:\\n\\n\\n\\n  *  all versions before 21.4R3-S12-EVO,\\u00a0\\n  *  all versions of 22.2-EVO,\\n  *  from 22.4 before 22.4R3-S8-EVO,\\u00a0\\n  *  from 23.2 before 23.2R2-S5-EVO,\\u00a0\\n  *  from 23.4 before 23.4R2-S6-EVO,\\u00a0\\n  *  from 24.2 before 24.2R2-S2-EVO,\\u00a0\\n  *  from 24.4 before 24.4R2-EVO,\\u00a0\\n  *  from 25.2 before 25.2R1-S1-EVO, 25.2R2-EVO.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"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.\u003cbr\u003e\u003cbr\u003e\\n\\nBy 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 \u0027forward-only\u0027 mode with Option 82, the device should drop the message unless \u0027trust-option82\u0027 is configured. Instead, the DHCP relay forwards these packets to the DHCP server unmodified, which uses up addresses in the DHCP server\u0027s address pool, ultimately leading to address pool exhaustion.\u003cbr\u003e\u003cbr\u003e\u003cp\u003eThis issue affects Junos OS:\u0026nbsp;\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003cul\u003e\u003cli\u003eall versions before 21.2R3-S10,\u003c/li\u003e\u003cli\u003efrom 21.4 before 21.4R3-S12,\u003c/li\u003e\u003cli\u003eall versions of 22.2,\u003c/li\u003e\u003cli\u003efrom 22.4 before 22.4R3-S8,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 23.2 before 23.2R2-S5,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 23.4 before 23.4R2-S6,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 24.2 before 24.2R2-S2,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 24.4 before 24.4R2,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 25.2 before 25.2R1-S1, 25.2R2.\u003c/li\u003e\u003c/ul\u003e\u003cp\u003e\u003c/p\u003e\u003cp\u003eJunos OS Evolved:\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003cul\u003e\u003cli\u003eall versions before 21.4R3-S12-EVO,\u0026nbsp;\u003c/li\u003e\u003cli\u003eall versions of 22.2-EVO,\u003c/li\u003e\u003cli\u003efrom 22.4 before 22.4R3-S8-EVO,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 23.2 before 23.2R2-S5-EVO,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 23.4 before 23.4R2-S6-EVO,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 24.2 before 24.2R2-S2-EVO,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 24.4 before 24.4R2-EVO,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 25.2 before 25.2R1-S1-EVO, 25.2R2-EVO.\u003c/li\u003e\u003c/ul\u003e\u003cp\u003e\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-754\", \"description\": \"CWE-754 Improper Check for Unusual or Exceptional Conditions\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"DHCP Relay must be configured for forward-only to be vulnerable to this issue:\\n\\n[ forwarding-options dhcp-relay forward-only ]\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"DHCP Relay must be configured for forward-only to be vulnerable to this issue:\u003cbr\u003e\u003cbr\u003e\u003ctt\u003e[ forwarding-options dhcp-relay forward-only ]\u003cbr\u003e\u003c/tt\u003e\", \"base64\": false}]}], \"providerMetadata\": {\"orgId\": \"8cbe9d5a-a066-4c94-8978-4b15efeae968\", \"shortName\": \"juniper\", \"dateUpdated\": \"2026-01-15T20:14:00.582Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-59960\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-16T16:27:58.152Z\", \"dateReserved\": \"2025-09-23T18:19:06.954Z\", \"assignerOrgId\": \"8cbe9d5a-a066-4c94-8978-4b15efeae968\", \"datePublished\": \"2026-01-15T20:14:00.582Z\", \"assignerShortName\": \"juniper\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.