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How the CVE Works:
The vulnerability resides within the modem firmware stack, specifically in a function that processes signaling messages from a cellular network base station. The code lacks proper validation of the length field within a received protocol data unit (PDU). When a User Equipment (UE), such as a smartphone, connects to a malicious rogue base station (e.g., an IMSI catcher or a manipulated small cell), this attacker-controlled station can craft and transmit a specially formatted message with an improperly large length value. Without the necessary bounds check, the modem’s parsing routine reads or writes memory outside the bounds of the intended buffer when processing this message. This out-of-bounds access leads to a memory corruption event, triggering a fatal exception in the modem’s real-time operating system. The result is a full crash and reboot of the modem processor, causing a persistent denial of service (loss of all cellular connectivity) until the device is power-cycled or the modem subsystem restarts, all without requiring any user interaction or elevated privileges on the target device.
DailyCVE Form:
Platform: Modem Firmware
Version: MediaTek-specific
Vulnerability: Missing Bounds Check
Severity: Critical
Date: 12/01/2025
Prediction: Q1 2025 Patch
What Undercode Say:
Analytics:
strings modem.bin | grep -i "moly" readelf -Ws modem_driver.ko | grep panic arm-none-eabi-objdump -d firmware_module.o
// Hypothetical vulnerable code pattern
void process_pdu(uint8_t data) {
uint16_t length = ((uint16_t)(data + 2)); // Read length from message
uint8_t buffer[bash];
memcpy(buffer, data + 4, length); // Missing check: length > 64
}
How Exploit:
1. Attacker sets up rogue base station.
2. Station broadcasts strong signal.
3. Target UE connects automatically.
4. Station transmits malicious PDU.
5. Malformed length field triggers overflow.
6. Modem accesses invalid memory.
7. Processor crashes, requiring reboot.
Protection from this CVE:
Apply vendor patch.
Validate message bounds.
Use secure base stations.
Impact:
Persistent network denial.
No user interaction required.
Remote attacker exploitation.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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