USB modems (E3372, for example) present a serial COM port when installed with the proper drivers (Huawei Mobile Partner or generic CDC drivers).
# List USB serial ports
ls /dev/ttyUSB*
# Usually ttyUSB0 or ttyACM0
Once connected, you will be prompted for a login. These vary by model and firmware: huawei modem terminal
If the default credentials fail, you may need to use the universal backdoor found in older firmware versions (use with caution): Username: admin / Password: adminHW. USB modems (E3372, for example) present a serial
While no definitive "smoking gun" backdoor has been publicly verified in consumer modems, vulnerabilities have been identified: If the default credentials fail, you may need
| Interface | Method | Purpose |
|-----------|--------|---------|
| Web UI (HTTP/HTTPS) | Port 80/443 | Full configuration, stats, SMS |
| TR-069 | Remote management (ISP) | Auto-provisioning, firmware update |
| Telnet/SSH | Disabled by default (some older models hackable) | Advanced debug |
| AT commands | USB serial port (ttyUSB0) | Signal query, mode control, SIM info |
| SNMP | Rarely supported | Not typical on consumer terminals |
| Huawei Hilink SDK | Local API (UDP/TCP) | 3rd party apps (e.g., HuaweiManager) |
| Command | Function | Example Output |
|--------|----------|----------------|
| AT | Check connection | OK |
| ATI | Modem info | E3372h-320 |
| AT+CGSN=1 | Get IMEI | 867823051234567 |
| AT+CIMI | Get IMSI | 310260123456789 |
| AT+CSQ | Signal quality | +CSQ: 18,99 |
| AT+COPS? | Current operator | +COPS: 0,0,"AT&T",7 |
| AT^CARDLOCK? | SIM lock status (Huawei) | ^CARDLOCK: 2,10,999 |
⚠️ Not all commands work on every model. Newer modems (HiLink firmware) block many AT commands.