CVE-2019-25318: 
AVS Audio Converter vulnerability analysis and mitigation

CVE-2019-25318 is a stack-based buffer overflow vulnerability in AVS Audio Converter version 9.1.2.600, developed by AVS4You. The flaw allows attackers to execute arbitrary code by supplying a malicious payload in the output folder text input field, which overwrites stack memory when the 'Browse' button is clicked. The vulnerability was published on February 12, 2026, and carries a CVSS v3.1 base score of 8.8 (High) (Red Hat CVE).

The root cause is a stack-based buffer overflow (CWE-121) in AVS Audio Converter 9.1.2.600's handling of the output folder text input. When a user clicks the 'Browse' button, the application fails to properly validate or bound-check the length of the input string, allowing an attacker-controlled payload to overwrite adjacent stack memory. Exploitation requires user interaction — specifically, the victim must trigger the 'Browse' button action with a crafted input — but requires no privileges or authentication. The exploit can be weaponized to spawn a bind shell on TCP port 9999, providing the attacker with remote command execution (Red Hat CVE).

Successful exploitation results in high impact to confidentiality, integrity, and availability on the affected system. An attacker can achieve arbitrary code execution in the context of the application user, potentially establishing a bind shell on port 9999 for persistent remote access. The scope is limited to the local system running AVS Audio Converter, but the bind shell could enable lateral movement within a network if the compromised host has further access (Red Hat CVE).

As of the time of reporting, there is no public proof-of-concept exploit and no confirmed evidence of in-the-wild exploitation (Red Hat CVE). The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. The EPSS score is approximately 0.033%, indicating a low probability of exploitation in the near term. Exploitation requires user interaction, which somewhat limits opportunistic attack scenarios.

1. Craft malicious payload: Prepare an oversized string payload designed to overflow the stack buffer in AVS Audio Converter's output folder input field, embedding shellcode or a bind shell payload targeting port 9999.
2. Deliver payload to victim: Social-engineer the target into opening AVS Audio Converter and pasting or entering the malicious string into the output folder text input field (e.g., via a pre-configured project file or direct user manipulation).
3. Trigger the vulnerability: Instruct or wait for the victim to click the 'Browse' button, which triggers the vulnerable code path that processes the output folder input without proper bounds checking.
4. Stack overflow and code execution: The oversized input overwrites the stack return address, redirecting execution to the attacker's shellcode, which opens a bind shell on TCP port 9999.
5. Connect to bind shell: The attacker connects to the victim's IP on port 9999 to obtain an interactive command shell with the privileges of the AVS Audio Converter process (Red Hat CVE).

• Network: Unexpected inbound or outbound TCP connections on port 9999 from the host running AVS Audio Converter; unusual listening services on port 9999 detected via netstat or endpoint detection tools.
• Process: AVS Audio Converter process spawning unexpected child processes (e.g., cmd.exe, powershell.exe, or shell interpreters); new network listener processes associated with the AVS Audio Converter PID.
• Logs: Windows Event Logs showing process creation events (Event ID 4688) for unexpected child processes spawned by the AVS Audio Converter executable; application crash logs or Dr. Watson/WER reports indicating stack corruption.
• File System: Presence of unexpected scripts, executables, or payloads written to disk by the AVS Audio Converter process in temp or application directories.

No official patch from AVS4You has been confirmed as available for this vulnerability. Organizations and users running AVS Audio Converter 9.1.2.600 should restrict access to the application and avoid using it with untrusted input in the output folder field. Monitor systems for unexpected network connections on TCP port 9999. As a longer-term measure, consider replacing AVS Audio Converter with an alternative audio conversion tool with a stronger security track record until a vendor patch is released (Red Hat CVE).

Coverage of CVE-2019-25318 has been limited to automated CVE alert aggregators and security feeds, including RedPacketSecurity and VulDB, with no notable researcher commentary or vendor statements beyond the Red Hat CVE advisory page (Red Hat CVE). No significant community discussion or media coverage has been identified.