CVE-2025-61611 Overview
CVE-2025-61611 is an improper input validation vulnerability affecting the modem component in Unisoc UDX710 chipsets running Linux Foundation Yocto. The vulnerability allows remote attackers to cause a denial of service condition without requiring any additional execution privileges or user interaction.
Critical Impact
Remote attackers can exploit this improper input validation flaw to crash or disable modem functionality, potentially disrupting cellular connectivity and communications on affected devices.
Affected Products
- Linux Foundation Yocto (all versions)
- Unisoc UDX710 chipset
- Devices utilizing Unisoc UDX710 modem with Yocto-based firmware
Discovery Timeline
- 2026-03-09 - CVE-2025-61611 published to NVD
- 2026-03-09 - Last updated in NVD database
Technical Details for CVE-2025-61611
Vulnerability Analysis
This vulnerability stems from improper input validation within the modem subsystem of Unisoc UDX710 chipsets. The modem component fails to adequately validate incoming data, allowing malformed or specially crafted network packets to trigger a denial of service condition. The attack can be launched remotely over the network without any authentication or user interaction required.
The vulnerability is classified under CWE-20 (Improper Input Validation), indicating that the modem software does not properly verify that input conforms to expected formats or constraints before processing. When exploited, this results in service disruption affecting device connectivity.
Root Cause
The root cause is improper input validation in the Unisoc UDX710 modem firmware. The modem processing logic fails to implement adequate boundary checks or input sanitization on network-received data, allowing attackers to supply malicious input that causes the modem subsystem to enter an unresponsive or crashed state.
Attack Vector
The attack vector is network-based, requiring no privileges or user interaction. An attacker can remotely send specially crafted packets to a vulnerable device's modem interface. The attack has low complexity, meaning no specialized conditions or configurations are required for successful exploitation. The impact is limited to availability—the vulnerability does not allow information disclosure or integrity compromise, but can effectively disable cellular communications on the target device.
The vulnerability affects the modem's input handling routines. When malformed data is received, insufficient validation allows the malicious input to cause resource exhaustion, crash the modem process, or trigger an unhandled exception that disrupts normal modem operations.
Detection Methods for CVE-2025-61611
Indicators of Compromise
- Unexpected modem crashes or restarts on affected devices
- Loss of cellular connectivity without apparent network issues
- Abnormal network traffic patterns targeting modem communication ports
- System logs showing modem subsystem errors or exceptions
Detection Strategies
- Monitor device logs for modem crash events or restart patterns
- Implement network intrusion detection rules for malformed packets targeting Unisoc modem interfaces
- Deploy endpoint monitoring to track modem subsystem stability and availability
- Analyze network traffic for anomalous patterns associated with DoS attempts
Monitoring Recommendations
- Enable comprehensive logging on devices with Unisoc UDX710 chipsets
- Configure alerts for repeated modem failures or connectivity disruptions
- Implement network-level monitoring for suspicious traffic targeting IoT and mobile device endpoints
- Regularly review firmware versions against vendor security advisories
How to Mitigate CVE-2025-61611
Immediate Actions Required
- Review the Unisoc Security Announcement for patch availability
- Inventory all devices using Unisoc UDX710 chipsets and Yocto firmware
- Prioritize patching for devices exposed to untrusted networks
- Implement network-level filtering to limit exposure of vulnerable modem interfaces
Patch Information
Unisoc has released a security advisory addressing this vulnerability. Organizations should consult the Unisoc Security Announcement for detailed patch information and updated firmware versions. Apply vendor-provided patches as soon as they become available to remediate the improper input validation issue in the modem component.
Workarounds
- Implement network segmentation to reduce exposure of affected devices
- Deploy network-level intrusion prevention to filter potentially malicious traffic
- Monitor affected devices for signs of exploitation and isolate compromised units
- Consider deploying additional network perimeter controls until patches can be applied
# Network monitoring example for suspicious modem-targeted traffic
# Review traffic patterns targeting devices with Unisoc chipsets
tcpdump -i eth0 -n 'host <device_ip>' -w modem_traffic.pcap
# Analyze captured traffic for anomalous patterns
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
