CVE-2026-20797 in XWEB 300D PRO
Summary
by MITRE • 02/27/2026
A stack based buffer overflow exists in an API route of XWEB Pro version 1.12.1 and prior, enabling unauthenticated attackers to cause stack corruption and a termination of the program.
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Analysis
by VulDB Data Team • 03/01/2026
The vulnerability identified as CVE-2026-20797 represents a critical stack-based buffer overflow flaw within the XWEB Pro software ecosystem. This issue specifically manifests within an application programming interface route of the software version 1.12.1 and earlier, creating a significant security risk for organizations utilizing this platform. The flaw operates at the core level of memory management where insufficient input validation allows malicious actors to manipulate stack memory structures through crafted API requests. The vulnerability's classification as stack-based indicates that the buffer overflow occurs in the program's stack memory segment, which is typically used for storing function parameters, local variables, and return addresses during program execution.
The technical exploitation of this vulnerability enables unauthenticated attackers to manipulate the program's execution flow by overflowing the designated stack buffer with excessive data. When the API endpoint processes input data that exceeds the allocated buffer size, the excess data overwrites adjacent memory locations on the stack, potentially corrupting critical program state information. This stack corruption can lead to unpredictable program behavior including crashes, segmentation faults, or more severe consequences such as arbitrary code execution. The vulnerability's impact extends beyond simple program termination as the memory corruption can be leveraged to manipulate program control flow and potentially gain unauthorized access to system resources. This type of vulnerability falls under the CWE-121 category of stack-based buffer overflow, which is a well-documented and dangerous class of memory safety issues that has been the subject of numerous security advisories and mitigation strategies.
From an operational standpoint, the vulnerability presents a substantial risk to organizations deploying XWEB Pro version 1.12.1 or earlier, as it allows attackers to cause program termination without requiring authentication credentials. The unauthenticated nature of this exploit means that any external party can potentially trigger the vulnerability, making it particularly dangerous in publicly accessible environments. The consequences of exploitation include service disruption through program termination, which can result in denial of service conditions affecting legitimate users and business operations. Organizations may experience downtime, loss of service availability, and potential data integrity issues if the system becomes unstable due to the memory corruption. The vulnerability also creates opportunities for attackers to perform reconnaissance activities or establish persistent access points if the buffer overflow can be carefully crafted to achieve more sophisticated exploitation techniques.
The mitigation strategies for this vulnerability primarily focus on immediate software updates and patches provided by the vendor to address the buffer overflow condition in the API endpoint. Organizations should prioritize upgrading to the latest version of XWEB Pro that contains the necessary security fixes and input validation improvements. Network segmentation and access controls can provide additional layers of protection by limiting exposure of the vulnerable API endpoints to untrusted networks. Implementing robust input validation mechanisms at the application level can help prevent malicious data from reaching the vulnerable code paths. Security monitoring and intrusion detection systems should be configured to identify unusual API request patterns that may indicate exploitation attempts. The ATT&CK framework categorizes this vulnerability under the T1203 technique for legitimate credentials and T1072 for software deployment tools, highlighting the potential for attackers to use such vulnerabilities as initial access vectors or for privilege escalation within compromised environments. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other components of the system architecture and ensure comprehensive protection against similar memory corruption issues.