CVE-2026-25622 in Edge Threat Management
Summary
by MITRE • 06/05/2026
A Captive Portal Custom Handler command injection vulnerability exists in Arista Edge Threat Management - Arista Next Generation Firewall (NGFW). On affected platforms, an administrative account logged into the user interface can exploit this input handling behavior to execute arbitrary platform shell commands.
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Analysis
by VulDB Data Team • 06/06/2026
This vulnerability represents a critical command injection flaw within Arista's Next Generation Firewall platform that specifically affects the Captive Portal Custom Handler functionality. The issue stems from inadequate input validation and sanitization mechanisms within the web interface handling of user-supplied data. When administrative users interact with the captive portal configuration features, maliciously crafted inputs can be processed without proper sanitization, allowing attackers to inject and execute arbitrary shell commands on the underlying platform. This represents a severe privilege escalation vulnerability that directly compromises the integrity and confidentiality of the network security infrastructure.
The technical exploitation of this vulnerability occurs through the manipulation of input fields within the Captive Portal Custom Handler component where user-provided parameters are directly passed to system shell commands without proper escaping or validation. The flaw aligns with CWE-77 and CWE-94 categories, which specifically address command injection vulnerabilities and improper validation of dangerous commands. Attackers can leverage this weakness by crafting malicious payloads that bypass normal input filters and execute arbitrary code with the privileges of the administrative account. The vulnerability exists in the web application layer where user inputs are improperly handled during the processing of captive portal configuration parameters.
Operationally, this vulnerability creates a significant risk to network security operations as it allows authenticated administrative users to gain full command execution capabilities on the firewall platform. The impact extends beyond simple command injection to potentially enable complete system compromise, data exfiltration, and lateral movement within the network environment. Attackers could leverage this vulnerability to establish persistent backdoors, modify firewall rules, disable security features, or access sensitive network information. The compromised firewall could serve as a launchpad for broader network infiltration activities, making this vulnerability particularly dangerous in enterprise environments where firewalls serve as critical security boundaries.
Mitigation strategies should focus on immediate patch application from Arista to address the specific input handling flaws within the Captive Portal Custom Handler. Organizations should implement network segmentation to limit access to administrative interfaces and enforce strict access controls through multi-factor authentication. Regular security assessments should include testing for similar input validation vulnerabilities across all network security appliances. The implementation of web application firewalls and input validation controls can provide additional layers of protection. Security monitoring should include detection of unusual command execution patterns and unauthorized administrative access attempts. This vulnerability demonstrates the importance of proper input validation and the principle of least privilege in network security infrastructure design.