CVE-2010-1318: RealNetworks Helix Server AgentX++ stack buffer overflow

Automated analysis

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

critical priorityThe vulnerability is remotely exploitable without authentication, allows arbitrary code execution, and has a very high EPSS score indicating likely exploitation activity.

What it is

A stack-based buffer overflow exists in the AgentX::receive_agentx function of AgentX++ 1.4.16, which is used in RealNetworks Helix Server and Helix Mobile Server 11.x through 13.x and other products. A remote attacker can trigger the overflow through unspecified vectors, potentially leading to arbitrary code execution. The flaw is critical because it is network-reachable, requires no authentication, and can fully compromise confidentiality, integrity, and availability.

Impact

An attacker can execute arbitrary code with the privileges of the affected service, leading to full system compromise. This could allow data theft, service disruption, or use of the host as a pivot point.

Attack surface

The vulnerability is reachable over the network via the AgentX protocol handling in the affected server products. No authentication or user interaction is required, as indicated by the CVSS vector AV:N/AC:L/Au:N.

Exploitation

The CVE is not listed in CISA KEV, but EPSS indicates a high probability of exploitation (0.58051, 99th percentile). References include vendor advisories, but no public exploit code or active exploitation is confirmed in the record.

What to do

• Apply the vendor security update referenced in the RealNetworks advisory (SecurityUpdate041410HS.pdf) as soon as possible.
• If patching is not immediately possible, restrict network access to the AgentX service to trusted hosts only.
• Monitor for and block malformed AgentX packets at the network perimeter if feasible.
• Consider disabling the AgentX functionality if it is not required for operations.
• Upgrade to a supported version of Helix Server or Helix Mobile Server that is not affected.

Detection

• Monitor network traffic for anomalous AgentX protocol packets, especially those with unusually large payloads.
• Check system logs for crashes or restarts of the Helix Server process that could indicate exploitation attempts.
• Use endpoint detection to look for unexpected child processes or code execution originating from the Helix Server service.
• Review vendor advisories and apply signatures for known exploitation patterns if available.

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