Vulnerability record · CVE-2006-2086 · published 29 April 2006
CVE-2006-2086: Juniper SSL-VPN Client ActiveX Control Buffer Overflow
Juniper · Junipersetup Control
JuniperSetupDLL.dll, loaded by JuniperSetup.ocx in the Juniper SSL-VPN Client, contains a buffer overflow triggered by a long argument in the ProductName parameter. It affects clients connecting to Juniper NetScreen IVE devices running IVE OS before 4.2r8.1, 5.0 before 5.0r6.1, 5.1 before 5.1r8, 5.2 before 5.2r4.1, or 5.3 before 5.3r2.1. Successful exploitation allows remote code execution on the client.
Description
Buffer overflow in JuniperSetupDLL.dll, loaded from JuniperSetup.ocx by the Juniper SSL-VPN Client when accessing a Juniper NetScreen IVE device running IVE OS before 4.2r8.1, 5.0 before 5.0r6.1, 5.1 before 5.1r8, 5.2 before 5.2r4.1, or 5.3 before 5.3r2.1, allows remote attackers to execute arbitrary code via a long argument in the ProductName parameter.
AV:N/AC:L/Au:N/C:P/I:P/A:P
Automated analysis
high priorityRemote, unauthenticated code execution with a high EPSS score, though no KEV listing or confirmed in-the-wild exploitation is present in the record.
What it is
JuniperSetupDLL.dll, loaded by JuniperSetup.ocx in the Juniper SSL-VPN Client, contains a buffer overflow triggered by a long argument in the ProductName parameter. It affects clients connecting to Juniper NetScreen IVE devices running IVE OS before 4.2r8.1, 5.0 before 5.0r6.1, 5.1 before 5.1r8, 5.2 before 5.2r4.1, or 5.3 before 5.3r2.1. Successful exploitation allows remote code execution on the client.
Impact
An attacker can execute arbitrary code on the machine running the vulnerable Juniper SSL-VPN Client, giving them the privileges of that client process. This can lead to full compromise of the endpoint.
Attack surface
The flaw is reached remotely over the network when the client accesses a malicious or compromised IVE device; the CVSS vector AV:N/AC:L/Au:N indicates no authentication is required. User interaction is not explicitly stated in the record, but the client must connect to the IVE device for the vulnerable control to load.
Exploitation
The record is not listed in CISA KEV and no ransomware groups are documented using it. EPSS is high (0.67312, 99.269th percentile), but no reference is tagged as exploit code or active exploitation.
What to do
- Upgrade IVE OS to 4.2r8.1, 5.0r6.1, 5.1r8, 5.2r4.1, or 5.3r2.1 or later as applicable.
- Update or remove the vulnerable Juniper SSL-VPN Client / JuniperSetup ActiveX control from endpoints.
- Restrict client connections to trusted, patched IVE devices only.
- Disable or block the JuniperSetup ActiveX control in browsers where it is not required.
Detection
- Monitor for crashes or abnormal behavior in JuniperSetupDLL.dll or JuniperSetup.ocx on client endpoints.
- Inspect network traffic to IVE devices for unusually long ProductName parameters.
- Audit installed Juniper SSL-VPN Client versions against the fixed IVE OS releases.
This assessment is produced automatically and is not human-reviewed. Verify against the vendor advisory before acting on it.
Affected products
1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.
References
Track CVE-2006-2086 inside VULONE
Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.
Source: NIST National Vulnerability Database (record CVE-2006-2086), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.
