CVE-2026-102061: CWE-121 Stack-based Buffer Overflow in Juniper Networks Junos OS
Description
CVE-2026-102061 is a stack-based buffer overflow vulnerability in the phone-home daemon (phcd) of Juniper Networks Junos OS and Junos OS Evolved. It allows an adjacent unauthenticated attacker to execute arbitrary code as root by sending a crafted DHCP SZTP bootstrap message. This vulnerability affects platforms that support Secure-ZTP. The issue has a high severity score of 8.8 and impacts multiple versions of Junos OS and Junos OS Evolved. No known exploits in the wild have been reported. Patch status is not confirmed in the provided data.
CVSS v3.1
Score 8.8high
Affected software
Juniper Networks
Junos OS
Juniper Networks
Junos OS Evolved
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-102061) is a stack-based buffer overflow (CWE-121) in the phone-home daemon (phcd) component of Juniper Networks Junos OS and Junos OS Evolved. An adjacent unauthenticated attacker can exploit this flaw by sending a specially crafted DHCP Secure Zero Touch Provisioning (SZTP) bootstrap message, resulting in arbitrary code execution with root privileges. The vulnerability affects multiple versions across Junos OS and Junos OS Evolved platforms that support Secure-ZTP. The CVSS v3.1 base score is 8.8, indicating high severity, with attack vector adjacent network, low attack complexity, no privileges required, no user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation allows an adjacent unauthenticated attacker to execute arbitrary code as root on affected Junos OS devices supporting Secure-ZTP. This can lead to full system compromise, including complete control over the device, potentially impacting confidentiality, integrity, and availability of the system and network.
Mitigation Recommendations
Patch status is not yet confirmed — check the Juniper Networks vendor advisory for current remediation guidance. Until a patch is applied, restrict access to the DHCP SZTP service to trusted adjacent networks and monitor for suspicious DHCP SZTP bootstrap messages. Follow Juniper's official guidance once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- juniper
- Date Reserved
- 2026-09-28T17:35:40.523Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6acfb66d2cdf04f6569794e5
Added to database: 10/14/2026, 17:05:49 UTC
Last enriched: 10/14/2026, 18:04:47 UTC
Last updated: 10/14/2026, 20:28:44 UTC
Views: 4
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