CVE-2026-34792 is an OS command injection vulnerability classified under CWE-78, affecting Endian Firewall version 3.3.25 and prior. The flaw exists in the handling of the DATE parameter within the /cgi-bin/logs_clamav.cgi CGI script. This parameter is intended to specify a date for log file retrieval but is improperly sanitized before being used to construct a file path in a Perl open() call. The input validation relies on an incomplete regular expression that fails to neutralize special shell metacharacters, enabling an authenticated attacker to inject arbitrary OS commands. Since the endpoint requires authentication but no further privilege escalation or user interaction, an attacker with valid credentials can exploit this vulnerability remotely over the network. Successful exploitation can lead to arbitrary command execution with the privileges of the web server process, potentially allowing attackers to read sensitive information, modify firewall configurations, disrupt network traffic, or pivot to other internal systems. The vulnerability has a CVSS 4.0 base score of 8.7, reflecting its high impact on confidentiality, integrity, and availability, combined with low attack complexity and no need for user interaction. No patches or official fixes are currently listed, and no public exploits have been observed, but the risk remains significant due to the nature of the flaw and the critical role of firewalls in network security.

The impact of CVE-2026-34792 is substantial for organizations deploying Endian Firewall version 3.3.25 or earlier. Exploitation allows attackers to execute arbitrary OS commands remotely after authentication, potentially leading to full system compromise. This can result in unauthorized access to sensitive data, disruption of firewall operations, manipulation or disabling of security controls, and lateral movement within the network. Given the firewall’s role in enforcing perimeter security and traffic filtering, a compromised device can undermine the entire network’s security posture. Organizations in sectors such as government, finance, healthcare, and critical infrastructure that rely on Endian Firewall for network protection are particularly vulnerable. The lack of known exploits in the wild does not diminish the threat, as the vulnerability’s characteristics make it an attractive target for attackers seeking to gain persistent access or disrupt operations.

To mitigate CVE-2026-34792, organizations should immediately upgrade Endian Firewall to a version that addresses this vulnerability once available. In the absence of an official patch, administrators should restrict access to the /cgi-bin/logs_clamav.cgi endpoint to trusted users only and enforce strong authentication controls to limit the pool of potential attackers. Network segmentation can reduce exposure by isolating firewall management interfaces from general user networks. Additionally, monitoring and logging of access to the vulnerable CGI script should be enhanced to detect suspicious activity. Implementing Web Application Firewall (WAF) rules to block suspicious input patterns targeting the DATE parameter may provide temporary protection. Finally, reviewing and hardening Perl scripts and input validation routines in custom or legacy components can prevent similar injection flaws.