CVE-2026-19746 in GigaSpire
Summary
by MITRE • 08/13/2026
A vulnerability has been found in Calix GigaSpire 26.1.0. The affected element is an unknown function of the file traceroute.cmd. The manipulation leads to denial of service. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 08/13/2026
The vulnerability identified in Calix GigaSpire 26.1.0 represents a critical denial of service weakness within the traceroute.cmd file that affects the network infrastructure management capabilities of the device. This issue stems from an unknown function within the command file that when manipulated can cause complete service disruption to the affected system. The vulnerability's remote exploitability means that attackers can initiate the attack from external networks without requiring physical access or local privileges, significantly expanding the potential threat surface and attack vectors available to malicious actors.
The technical nature of this flaw suggests a lack of proper input validation or sanitization within the traceroute.cmd script execution environment. When the vulnerable function processes manipulated inputs, it likely causes the system to enter an unrecoverable state or execute unintended code paths that result in complete service termination. This type of vulnerability falls under the CWE-400 category of Uncontrolled Resource Consumption, where the system's resources become exhausted through malformed input processing, leading to denial of service conditions. The absence of vendor response despite early disclosure indicates a potential gap in the security advisory process and may suggest inadequate monitoring or prioritization of vulnerabilities affecting enterprise networking equipment.
The operational impact of this vulnerability extends beyond simple service interruption to potentially compromise network monitoring capabilities and overall infrastructure reliability. Organizations relying on Calix GigaSpire devices for their network management and diagnostic functions face significant risks, as the denial of service could disrupt critical network operations including routing, traffic analysis, and network health monitoring. The public disclosure of the exploit increases the likelihood of real-world exploitation, particularly given the remote accessibility and the demonstrated capability to trigger system failure without requiring elevated privileges. This vulnerability aligns with ATT&CK technique T1499.004 for Network Denial of Service, where adversaries leverage weaknesses in network infrastructure to disrupt services and create operational disruptions.
Organizations should immediately implement network segmentation and access controls to limit potential exploitation vectors, while also considering temporary workarounds such as disabling the traceroute.cmd functionality or implementing firewall rules to restrict remote access to affected components. The lack of vendor response underscores the importance of maintaining internal security monitoring capabilities and developing incident response procedures for unpatched vulnerabilities. Regular vulnerability assessments should include thorough examination of network device command processing functions, particularly those with remote execution capabilities, to identify similar weaknesses before they can be exploited by malicious actors. Security teams should also consider implementing intrusion detection systems capable of identifying suspicious patterns in traceroute command usage that could indicate attempted exploitation of this vulnerability or related weaknesses in the network infrastructure stack.