An Improper Validation of Syntactic Correctness of Input vulnerability in the VPN daemon of Juniper Networks Junos OS on SRX Series allows an authenticated, network-based attacker to take complete control of the device.

If an SRX device configured for AutoDiscovery VPN (ADVPN) receives a message from a peer that contains one or more specifically malformed attributes, this will cause a buffer overflow, which can allow remote code execution and therefore allow an attacker to take complete control of the device. To be able to carry out this attack an attacker must either have acquired the shared secret to impersonate a peer or have compromised an existing one, so this attack is considerably difficult.

This issue affects Junos OS on SRX Series:

• All versions before 23.2R2-S7.7;
• from 23.4 before 23.4R2-S7;
• from 24.2 before 24.2R2-S4;
• from 24.4 before 24.4R2-S3;
• from 25.2 before 25.2R2;
• from 25.4 before 25.4R1-S3.

To be exposed to this issue ADVPN needs to be configured:

[ security ike gateway <gateway> advpn ... ]


Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen during production usage.

This issue has been assigned CVE-2026-102084.

The following software releases have been updated to resolve this specific issue: Junos OS: 23.2R2-S7.7, 23.4R2-S7, 24.2R2-S4, 24.4R2-S3, 25.2R2, 25.4R1-S3, 26.2R1, and all subsequent releases.

Note: For Junos OS release 23.2, a specific respin has been referenced. Previously published versions of this release have been rebuilt to resolve the security vulnerabilities identified in this advisory.

This issue is being tracked as 1922601 which is visible on the Customer Support website.

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).

There are no known workarounds for this issue.

2026-10-14: Initial Publication

• KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin Publication Process [juniper.net]
• KB16765: In which releases are vulnerabilities fixed? [juniper.net]
• KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories [juniper.net]
• Report a Security Vulnerability - How to Contact the Juniper Networks Security Incident Response Team