CVE-2025-59960

Junos OS and Junos OS Evolved: DHCP Option 82 messages from clients being passed unmodified to the DHCP server

HIGH

7.4

CVSS Score

Published: January 15, 2026 at 08:14 PM UTC

Updated: June 17, 2026 at 09:46 AM UTC

3 products affected across 2 vendorsJunosJunos OS EvolvedJunos OS Evolved

Using Junos OS by Juniper Networks?

Get instant alerts when new vulnerabilities affect Junos OS - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

HIGH7.4

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Junos · Juniper Networks

95%

v < 21.2v < 21.2R3-S1021.4 ≤ v < 21.4R3-S1222.2 ≤ v < 22.2*22.4 ≤ v < 22.4R3-S823.2 ≤ v < 23.2R2-S523.4 ≤ v < 23.4R2-S624.2 ≤ v < 24.2R2-S224.4 ≤ v < 24.4R225.2 ≤ v < 25.2R1-S1, 25.2R221.2 21.2 r1 21.2 r1-s1 21.2 r1-s2 21.2 r2 21.2 r2-s1 21.2 r2-s2 21.2 r3 21.2 r3-s1 21.2 r3-s2 21.2 r3-s3 21.2 r3-s4 21.2 r3-s5 21.2 r3-s6 21.2 r3-s7 21.2 r3-s8 21.2 r3-s9 21.4 21.4 r1 21.4 r1-s1 21.4 r1-s2 21.4 r2 21.4 r2-s1 21.4 r2-s2 21.4 r3 21.4 r3-s1 21.4 r3-s10 21.4 r3-s11 21.4 r3-s2 21.4 r3-s3 21.4 r3-s4 21.4 r3-s5 21.4 r3-s6 21.4 r3-s7 21.4 r3-s8 21.4 r3-s9 22.2 22.4 22.4 r1 22.4 r1-s1 22.4 r1-s2 22.4 r2 22.4 r2-s1 22.4 r2-s2 22.4 r3 22.4 r3-s1 22.4 r3-s2 22.4 r3-s3 22.4 r3-s4 22.4 r3-s5 22.4 r3-s6 22.4 r3-s7 23.2 23.2 r1 23.2 r1-s1 23.2 r1-s2 23.2 r2 23.2 r2-s1 23.2 r2-s2 23.2 r2-s3 23.2 r2-s4 23.4 23.4 r1 23.4 r1-s1 23.4 r1-s2 23.4 r2 23.4 r2-s1 23.4 r2-s2 23.4 r2-s3 23.4 r2-s4 23.4 r2-s5 24.2 24.2 r1 24.2 r1-s1 24.2 r1-s2 24.2 r2 24.2 r2-s1 24.4 24.4 r1 24.4 r1-s2 24.4 r1-s3 25.2 25.2 r1 25.2 r2

Affected range stops below 21.2R3-S10, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.4R3-S12, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2*, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.4R3-S8, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.2R2-S5, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.4R2-S6, so it looks safe — our inference, not a vendor statement

Affected range stops below 24.2R2-S2, so it looks safe — our inference, not a vendor statement

Affected range stops below 24.4R2, so it looks safe — our inference, not a vendor statement

Affected range stops below 25.2R1-S1, 25.2R2, so it looks safe — our inference, not a vendor statement

Junos OS Evolved · Juniper Networks

60%

v < 21.4R3-S12-EVO22.2 ≤ v < 22.2*22.4 ≤ v < 22.4R3-S8-EVO23.2 ≤ v < 23.2R2-S5-EVO23.4 ≤ v < 23.4R2-S6-EVO24.2 ≤ v < 24.2R2-S2-EVO24.4 ≤ v < 24.4R2-EVO25.2 ≤ v < 25.2R1-S1-EVO, 25.2R2-EVO22.2 22.4 23.2 23.4 24.2 24.4 25.2

Affected range stops below 21.4R3-S12-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2*, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.4R3-S8-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.2R2-S5-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.4R2-S6-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 24.2R2-S2-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 24.4R2-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 25.2R1-S1-EVO, 25.2R2-EVO, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor AdvisoryPermissions Required

Source: cverecord

https://supportportal.juniper.net/

Vendor Advisory

Source: cverecord

https://kb.juniper.net/JSA103149

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.4HIGHjuniper

Attack Vector: ADJACENT_NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: CHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusANALYZED

CWE

CWE-754

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create account Sign in

Free plan, no card