CVE-2019-25232 in NetPCLinker
Summary
by MITRE • 01/31/2026
NetPCLinker 1.0.0.0 contains a buffer overflow vulnerability in the Clients Control Panel DNS/IP field that allows attackers to execute arbitrary shellcode. Attackers can craft a malicious payload in the DNS/IP input to overwrite SEH handlers and execute shellcode when adding a new client.
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Analysis
by VulDB Data Team • 01/31/2026
The vulnerability identified as CVE-2019-25232 represents a critical buffer overflow flaw within NetPCLinker version 1.0.0.0, specifically affecting the Clients Control Panel functionality. This issue manifests in the DNS/IP field input validation mechanism where insufficient bounds checking allows attackers to inject malicious data exceeding the allocated buffer space. The vulnerability resides in the client management interface where administrators can add new clients to the network, making it particularly dangerous as it targets administrative functions that are frequently accessed and trusted by network operators.
The technical implementation of this flaw demonstrates a classic stack-based buffer overflow condition that occurs when user-supplied input is directly copied into a fixed-size buffer without proper validation. The DNS/IP field in the client control panel accepts input that gets processed through a vulnerable code path, allowing attackers to craft payloads that exceed the buffer boundaries and overwrite adjacent memory locations including the structured exception handler (SEH) chain. This memory corruption directly enables attackers to manipulate program execution flow by overwriting SEH handlers with malicious addresses pointing to injected shellcode.
The operational impact of this vulnerability extends beyond simple code execution as it provides attackers with a pathway to gain unauthorized access to network infrastructure managed by NetPCLinker. When administrators add new clients through the compromised interface, the system becomes vulnerable to arbitrary code execution, potentially allowing attackers to escalate privileges, establish persistent backdoors, or exfiltrate sensitive network information. The vulnerability's exploitation requires minimal privileges and can be executed through standard administrative interface interactions, making it particularly attractive to threat actors seeking to compromise network environments.
Security professionals should note that this vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which specifically addresses buffer overflows occurring in stack memory regions. The attack vector follows patterns consistent with ATT&CK technique T1059.007 for command and scripting interpreter, where attackers leverage buffer overflow conditions to execute malicious code. Mitigation strategies should include immediate patching of the NetPCLinker application to address the buffer overflow condition, implementing input validation controls, and restricting administrative access to the client management interface. Network segmentation and monitoring of administrative interface usage can provide additional defensive layers to detect potential exploitation attempts and limit the attack surface of vulnerable systems.