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The CVE-2025-20790 vulnerability exists in MediaTek modem firmware due to improper input validation during communication with base stations. When a User Equipment (UE), such as a smartphone, connects to a cellular network, the modem processes signaling messages from the base station. Attackers can set up a rogue base station using software-defined radio (SDR) tools to transmit crafted malicious messages. These messages contain invalid or malformed data that the modem fails to validate correctly. This flaw triggers memory corruption, such as a buffer overflow, within the modem’s software stack. As a result, the modem crashes, leading to a complete denial of service. The crash disables all cellular functionalities, including voice, SMS, and data services. Exploitation requires no user interaction and no additional privileges. The rogue base station can be deployed to target UEs in its coverage area. The vulnerability likely affects protocol handling in LTE or 5G NR stacks. MediaTek’s patch, identified by MOLY01677581, addresses the input validation routines. This issue highlights critical risks in telecom infrastructure security.
Platform: MediaTek Modem
Version: Not specified
Vulnerability: Remote DoS
Severity: Critical
date: 12/01/2025
Prediction: Patch available
What Undercode Say:
Analytics:
Bash command: check modem firmware
Code: srsRAN eNB config
Bash: ati for version
Code: craft malicious SIBs
Stats: affected devices millions
how Exploit:
Set up rogue base station using SDR tools like USRP or HackRF. Configure eNB software such as srsRAN to broadcast crafted System Information Blocks (SIBs) or RRC messages with invalid parameters. Target UEs within range to connect automatically, triggering modem crash via unhandled input.
Protection from this CVE
Apply MediaTek patch MOLY01677581. Update modem firmware to latest version. Use network monitoring tools to detect rogue base stations. Disable automatic network selection where possible. Implement input validation in modem software stack.
Impact:
Complete loss of cellular connectivity leading to denial of service. Potential device reboot required. Affects voice, data, and emergency services. High risk in public gatherings or critical infrastructure. Widespread impact due to MediaTek chipset prevalence.
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Sources:
Reported By: nvd.nist.gov
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