CVE-2006-2926: Qbik WinGate WWW Proxy Server stack buffer overflow via long URL

Automated analysis

Generated by VULONE's analysis model from the NVD record, CISA KEV and EPSS data on 19 September 2026. Confidence: medium.

high priorityRemote, unauthenticated, low-complexity buffer overflow with public exploit references and very high EPSS, though no KEV listing or confirmed in-the-wild activity is recorded.

What it is

The WWW Proxy Server component of Qbik WinGate 6.1.1.1077 contains a stack-based buffer overflow triggered by a long URL in an HTTP request. A remote, unauthenticated attacker can crash the proxy and potentially execute arbitrary code in its context, which matters because the proxy is internet-facing and needs no credentials to reach.

Impact

An attacker can cause a denial of service against the proxy service and possibly execute arbitrary code with the privileges of the WinGate process. Successful code execution would give the attacker a foothold on the host running the proxy.

Attack surface

Reachable over the network through the WWW Proxy Server's HTTP handling; the CVSS vector AV:N/AC:L/Au:N indicates no authentication and no user interaction are required. The attacker only needs to send a crafted HTTP request containing an overly long URL.

Exploitation

No CISA KEV listing and no ransomware association are recorded, but public references are tagged Exploit and EPSS is very high (0.70702, 99.36th percentile), indicating exploit code is publicly available and exploitation is likely.

What to do

• Upgrade WinGate to a version later than 6.1.1.1077 or apply the vendor fix referenced in the Secunia advisory.
• If the proxy cannot be patched immediately, restrict network access to the WWW Proxy Server port to trusted clients only.
• Place the proxy behind a filtering layer that rejects or truncates abnormally long request URLs.
• Run the WinGate service with least privilege so any code execution has limited impact.
• Monitor vendor advisories for a confirmed fixed build, since the record does not list affected or fixed versions.

Detection

• Alert on HTTP requests to the proxy containing URLs far longer than normal baseline lengths.
• Monitor WinGate process crashes or restarts and correlate them with inbound proxy requests.
• Inspect proxy and network logs for repeated malformed or oversized URL requests from a single source.
• Watch for unexpected child processes or outbound connections originating from the WinGate service.

This assessment is produced automatically and is not human-reviewed. Verify against the vendor advisory before acting on it.