CVE-2026-20405
Modem Manufacturer · Modem Firmware
Modem firmware is susceptible to a system crash due to a missing bounds check, which can be triggered by malformed input.
Executive summary
A missing bounds check in modem firmware allows for a system crash, creating a significant Denial of Service risk for the affected hardware.
Vulnerability
This vulnerability stems from a missing bounds check within the modem's firmware components. By sending crafted data that exceeds expected limits, an unauthenticated attacker can trigger a crash of the modem's operating system.
Business impact
The resulting system crash leads to a total loss of network availability for the affected device. The CVSS score of 7.5 reflects the high impact on business continuity, as communication failures can prevent access to cloud services, remote offices, and customer-facing applications.
Remediation
Immediate Action: Deploy the manufacturer's firmware update that specifically addresses the missing bounds check vulnerability.
Proactive Monitoring: Implement automated alerts for device downtime to ensure rapid response if a DoS attack occurs.
Compensating Controls: Use intrusion prevention systems (IPS) to detect and drop packets that exhibit characteristics of buffer overflow or bounds-violation attempts.
Exploitation status
Public Exploit Available: false
Analyst recommendation
Immediate patching is the only effective mitigation. IT administrators should verify the firmware versions of all deployed modems and update any that are running vulnerable software to prevent service interruptions.