CVE-2018-25313: 
SysGauge vulnerability analysis and mitigation

CVE-2018-25313 is a classic buffer overflow vulnerability in SysGauge version 4.5.18, affecting the application's proxy configuration handler. Local attackers can exploit this flaw to cause a denial of service by supplying an oversized string in the Proxy Server Host Name field within the Options menu, crashing the application. The vulnerability was formally published to the NVD and GitHub Advisory Database on April 29, 2026, and is assigned GHSA-7qx3-c8gc-gmg7. It carries a CVSS v3.1 base score of 6.2 (Medium) and a CVSS v4.0 base score of 6.9 (Medium) (GitHub Advisory, VulnCheck).

The root cause is classified as CWE-120 (Buffer Copy without Checking Size of Input — 'Classic Buffer Overflow'): the application copies user-supplied input from the Proxy Server Host Name field into a fixed-size buffer without validating the input length. An attacker with local access to the SysGauge application can navigate to the Options menu, enter an oversized string in the Proxy Server Host Name field, and trigger a buffer overflow condition that crashes the process. No privileges are required and no user interaction beyond the attacker's own actions is necessary. A public exploit entry exists on Exploit-DB (EDB-44372) documenting the technique (GitHub Advisory, Exploit-DB).

Successful exploitation results in a denial of service — the SysGauge application crashes, making it unavailable for system monitoring tasks. The impact is limited strictly to availability; there is no confidentiality or integrity compromise, and the vulnerability does not enable code execution, data exfiltration, or lateral movement based on current analysis. The scope is confined to the local system running SysGauge 4.5.18 (GitHub Advisory, VulnCheck).

A public proof-of-concept exploit has been documented on Exploit-DB (EDB-44372), though no evidence of active in-the-wild exploitation has been observed (Exploit-DB, VulnCheck). The EPSS score is approximately 0.013–0.018%, indicating a very low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, and no threat actor attribution has been reported.

1. Local Access: Obtain local access to a Windows system running SysGauge version 4.5.18 (no elevated privileges required).
2. Open Options Menu: Launch the SysGauge application and navigate to the Options or Settings menu.
3. Locate Proxy Configuration: Find the proxy configuration section containing the "Proxy Server Host Name" input field.
4. Inject Oversized Payload: Enter a large string (e.g., a sequence of 'A' characters exceeding the buffer size, as documented in EDB-44372) into the Proxy Server Host Name field.
5. Trigger Crash: Confirm or save the settings; the application fails to validate the input length, the buffer overflows, and SysGauge crashes, resulting in a denial of service (Exploit-DB, GitHub Advisory).

• Logs: Unexpected application crash logs or Windows Event Log entries (Event ID 1000/1001) referencing the SysGauge process (sysgauge.exe) with a faulting module related to a buffer overwrite.
• Process: Sudden termination of the sysgauge.exe process without user-initiated shutdown.
• File System: Presence of crash dump files (.dmp) in the SysGauge installation directory or %LOCALAPPDATA%\CrashDumps associated with sysgauge.exe.

Organizations running SysGauge 4.5.18 should upgrade to a patched version of the software; a patch was noted as available as of April 29, 2026 (GitHub Advisory). As an interim measure, restrict access to the SysGauge application and its configuration options to trusted users only, minimizing the local attack surface. Additionally, monitor system logs for unexpected SysGauge application crashes as a detection measure (VulnCheck).