Junos OS and Junos OS Evolved: An attacker causes jdhcpd to crash when the DHCPv4 local-client feature is used
Summary
| CVE | CVE-2026-102052 |
|---|---|
| State | PUBLISHED |
| Assigner | juniper |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-14 17:18:00 UTC |
| Updated | 2026-10-16 15:17:01 UTC |
| Description | A Stack-based Buffer Overflow vulnerability in the jdhcpd process of Juniper Networks Junos OS and Junos OS Evolved platforms allows an adjacent unauthenticated attacker to cause denial of service or execute arbitrary code with root privileges via a malformed DHCPv4 server response when the DHCPv4 local-client feature is used. |
Risk And Classification
Primary CVSS: v4.0 8.7 HIGH from [email protected]
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:C/RE:M/U:X
Problem Types: CWE-121 | CWE-121 CWE-121 Stack-based Buffer Overflow
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 8.7 | HIGH | CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/E:X/C... |
| 4.0 | CNA | CVSS | 8.7 | HIGH | CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/AU:Y/... |
| 3.1 | [email protected] | Secondary | 8.8 | HIGH | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | CVSS | 8.8 | HIGH | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
CVSS v4.0 Breakdown
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:C/RE:M/U:X
CVSS v3.1 Breakdown
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Juniper Networks | Junos OS | affected 23.2R2-S7.7 custom | Not specified |
| CNA | Juniper Networks | Junos OS | affected 23.4 23.4R2-S8.13 custom | Not specified |
| CNA | Juniper Networks | Junos OS | affected 24.2 24.2R2-S5.5 custom | Not specified |
| CNA | Juniper Networks | Junos OS | affected 24.4 24.4R2-S5 custom | Not specified |
| CNA | Juniper Networks | Junos OS | affected 25.2 25.2R2-S2 custom | Not specified |
| CNA | Juniper Networks | Junos OS | affected 25.4 25.4R1-S3 custom | Not specified |
| CNA | Juniper Networks | Junos OS | affected 26.2 26.2R1-S2 custom | Not specified |
| CNA | Juniper Networks | Junos OS Evolved | affected 23.2R2-S7.7-EVO custom | Not specified |
| CNA | Juniper Networks | Junos OS Evolved | affected 23.4 23.4R2-S8.11-EVO custom | Not specified |
| CNA | Juniper Networks | Junos OS Evolved | affected 24.2 24.2R2-S5.6-EVO custom | Not specified |
| CNA | Juniper Networks | Junos OS Evolved | affected 24.4 24.4R2-S5-EVO custom | Not specified |
| CNA | Juniper Networks | Junos OS Evolved | affected 25.2 25.2R2-S2-EVO custom | Not specified |
| CNA | Juniper Networks | Junos OS Evolved | affected 25.4 25.4R1-S3-EVO custom | Not specified |
| CNA | Juniper Networks | Junos OS Evolved | affected 26.2 26.2R1-S2-EVO custom | Not specified |
| CNA | Juniper Networks | Junos OS Evolved | affected 23.4X100 custom | Not specified |
| CNA | Juniper Networks | Junos OS Evolved | affected 25.2X100 25.2X100-D35-EVO custom | Not specified |
| CNA | Juniper Networks | Junos OS Evolved | affected 25.4X300 25.4X300-D40-EVO custom | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| supportportal.juniper.net/JSA112187 | [email protected] | supportportal.juniper.net | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Additional Advisory Data
Solutions
CNA: The following software releases have been updated to resolve this specific issue: Junos OS: 23.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, 25.4R2, 26.2R1-S2, 26.2R2, 26.4R1, and all subsequent releases. Junos OS Evolved: 23.2R2-S7.7-EVO, 23.4R2-S8.11-EVO, 24.2R2-S5.6-EVO, 24.4R2-S5-EVO, 25.2R2-S2-EVO, 25.2X100-D35-EVO, 25.4R1-S3-EVO, 25.4R2-EVO, 25.4X300-D40-EVO, 26.2R1-S2-EVO, 26.2R2-EVO, 26.4R1-EVO, and all subsequent releases. Note: For Junos OS releases 23.2, 23.4, and 24.2, and Junos OS Evolved releases 23.2-EVO, 23.4-EVO, and 24.2-EVO, specific respins have been referenced. Previously published versions of these releases have been rebuilt to resolve the security vulnerabilities identified in this advisory.
Workarounds
CNA: There are no known workarounds for this issue.
Exploits
CNA: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.