CVE-2026-102057 Juniper Networks CVE debrief

Who should care

Defenders responsible for Juniper Networks Junos OS deployments should assess exposure and prioritize verification and updates to prevent potential service disruptions. This includes network administrators, security teams, and IT professionals managing Junos OS-based infrastructure. They should review the CVE record, vendor advisories, and assess their network configurations to ensure they are not vulnerable to this exploit.

Why it matters

Defenders should prioritize verifying and updating Junos OS versions to prevent potential service disruptions caused by a Stack-based Buffer Overflow vulnerability in the jdhcpd process.

• Potential denial of service via DHCP client response
• Interruption of related DHCP, relay, and zero-touch-provisioning services
• Need for verification and updates to Junos OS versions

Technical summary

A Stack-based Buffer Overflow vulnerability in the jdhcpd process of Juniper Networks Junos OS allows an unauthenticated adjacent attacker to cause a denial of service via a DHCP client response. The vulnerability arises from improper handling of DHCP client requests, leading to a buffer overflow condition that can be exploited to disrupt DHCP services. This issue affects DHCP client operation and can interrupt related DHCP, relay, and zero-touch-provisioning services. The technical impact includes potential service disruptions and the need for immediate remediation.

Defensive priority

Defenders should prioritize verifying and updating Junos OS versions to prevent potential service disruptions.

Recommended defensive actions

• Verify Junos OS versions and update to fixed versions if available
• Monitor DHCP client operation and related services for potential disruptions
• Implement compensating controls to mitigate potential impacts
• Review network configurations for potential exposure
• Conduct vulnerability assessments to identify affected systems
• Prioritize patching based on asset criticality and potential impact
• Track and verify remediation efforts

Evidence notes

The CVE record and source item provide details on the vulnerability, but limited information is available on affected versions and potential impacts. Defenders should verify Junos OS versions, review vendor advisories for specific guidance, and assess their exposure to this vulnerability. Additional information from vendor sources or public advisories may be necessary to fully understand the scope of this vulnerability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.