CVE-2025-20800

// CVE-2025-20800 PoC Concept (Pseudo-code) // This vulnerability requires prior System privilege // Based on MediaTek mminfra out-of-bounds write (MSV-5033) /* Vulnerability Trigger Pattern: 1. Attacker needs low-privilege access to device 2. Target mminfra service with missing bounds check 3. Craft malicious input to trigger OOB write 4. Overwrite critical memory structures 5. Achieve System-level privilege escalation Note: Actual PoC requires deep knowledge of MediaTek firmware and device-specific memory layout. This is a conceptual example. */ #include <stdio.h> #include <stdlib.h> // Simulated vulnerable function in mminfra void mminfra_process_input(int* buffer, int size, int* user_input) { // Missing bounds check - vulnerability root cause for (int i = 0; i < size; i++) { buffer[i] = user_input[i]; } } // Trigger function int trigger_vulnerability() { int buffer[16]; // Small buffer int malicious_input[32]; // Larger input array // Initialize malicious input to trigger OOB write for (int i = 0; i < 32; i++) { malicious_input[i] = 0x41414141; // Pattern for exploitation } // This call will write beyond buffer bounds mminfra_process_input(buffer, 32, malicious_input); return 0; } int main() { printf("CVE-2025-20800 PoC Trigger\n"); printf("MediaTek mminfra OOB Write\n"); trigger_vulnerability(); return 0; }

{"cve": {"id": "CVE-2025-20800", "sourceIdentifier": "[email protected]", "published": "2026-01-06T02:15:44.060", "lastModified": "2026-01-08T19:23:42.990", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In mminfra, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS10267349; Issue ID: MSV-5033."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-787"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:google:android:14.0:*:*:*:*:*:*:*", "matchCriteriaId": "2700BCC5-634D-4EC6-AB67-5B678D5F951D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:google:android:15.0:*:*:*:*:*:*:*", "matchCriteriaId": "8538774C-906D-4B03-A3E7-FA7A55E0DA9E"}, {"vulnerable": true, "criteria": "cpe:2.3:o:google:android:16.0:-:*:*:*:*:*:*", "matchCriteriaId": "02882AB1-7993-47DD-84A0-8DF4272D85ED"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt2718:-:*:*:*:*:*:*:*", "matchCriteriaId": "F5506327-7DDF-4E88-9EA8-10B8E32F848B"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6899:-:*:*:*:*:*:*:*", "matchCriteriaId": "C6E9F80F-9AC9-41E0-BB14-9DB6F14B62CD"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6989:-:*:*:*:*:*:*:*", "matchCriteriaId": "AD7DE6B2-66D9-4A3E-B15F-D56505559255"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6991:-:*:*:*:*:*:*:*", "matchCriteriaId": "CBBB30DF-E963-4940-B742-F6801F68C3FC"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt8678:-:*:*:*:*:*:*:*", "matchCriteriaId": "152A5F3D-8004-4649-BDB1-E6F0798AF1CB"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt8793:-:*:*:*:*:*:*:*", "matchCriteriaId": "2FBD3487-F8CE-406C-8BD7-DD57FF8CD60B"}]}]}], "references": [{"url": "https://corp.mediatek.com/product-security-bulletin/January-2026", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}