CVE-2022-44139 is a critical SQL Injection vulnerability affecting Apartment Visitor Management System version 1.0. The vulnerability exists in the /avms/index.php endpoint, where user-supplied input is improperly sanitized before being incorporated into SQL queries. This lack of input validation allows an unauthenticated attacker to inject malicious SQL code directly into the backend database queries. Exploiting this flaw can lead to full compromise of the database confidentiality, integrity, and availability. Specifically, an attacker can extract sensitive data such as resident information, visitor logs, and authentication credentials, modify or delete records, or even execute administrative commands on the database server. The vulnerability is remotely exploitable over the network without requiring any authentication or user interaction, making it highly accessible to attackers. The CVSS 3.1 base score of 9.8 reflects the critical nature of this vulnerability, with attack vector being network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and high impact on confidentiality (C:H), integrity (I:H), and availability (A:H). No patches or vendor advisories have been published yet, and no known exploits have been observed in the wild as of the publication date. The vulnerability is classified under CWE-89, which corresponds to SQL Injection, a well-known and widely exploited class of vulnerabilities. Given the nature of the affected system—an Apartment Visitor Management System—successful exploitation could severely impact the privacy and security of residents and visitors, potentially leading to identity theft, unauthorized physical access, or disruption of building security operations.

For European organizations, particularly property management companies, residential complexes, and smart building operators using the vulnerable Apartment Visitor Management System v1.0, this vulnerability poses a significant risk. Exploitation could lead to unauthorized disclosure of personally identifiable information (PII) of residents and visitors, violating GDPR and other privacy regulations, potentially resulting in heavy fines and reputational damage. Integrity compromise could allow attackers to manipulate visitor logs, enabling unauthorized physical access or masking malicious activities. Availability impacts could disrupt visitor management operations, causing operational delays and security lapses in residential buildings. Given the criticality and ease of exploitation, attackers could leverage this vulnerability to conduct targeted attacks against high-value residential complexes or use compromised systems as pivot points for broader network intrusion. The lack of authentication requirement increases the attack surface, making it easier for cybercriminals or state-sponsored actors to exploit remotely. The absence of patches means organizations remain exposed unless mitigations are applied. This vulnerability also raises concerns for European smart city initiatives and IoT deployments in residential environments, where visitor management systems are integral to security infrastructure.

1. Immediate mitigation should include deploying web application firewalls (WAFs) with custom rules to detect and block SQL injection payloads targeting /avms/index.php. 2. Network segmentation should isolate the visitor management system from critical internal networks to limit lateral movement in case of compromise. 3. Organizations should conduct thorough input validation and parameterized query implementation in the application code to prevent SQL injection; if source code access is unavailable, consider vendor engagement or replacement of the vulnerable system. 4. Monitor logs for unusual database queries or access patterns indicative of exploitation attempts. 5. Restrict database user privileges to the minimum necessary, preventing execution of administrative commands via SQL injection. 6. Implement multi-factor authentication and strong access controls on management interfaces to reduce risk from other attack vectors. 7. Regularly back up visitor management system data and test restoration procedures to mitigate availability impacts. 8. Engage in threat intelligence sharing with industry groups to stay informed about emerging exploits or patches. 9. If possible, temporarily disable or restrict external access to the /avms/index.php endpoint until a patch or secure update is available. 10. Conduct penetration testing focused on injection vulnerabilities to identify and remediate similar issues in related systems.