{"id":"CVE-2026-20564","kind":"vulnerability","aliases":["CVE-2026-20564"],"related":[],"title":"Modem: out-of-bounds write from a bad bounds check crashes the device","description":"In Modem, there is a possible out of bounds write due to an incorrect bounds check. This could lead to local denial of service with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01780439; Issue ID: MSV-8901.","summary":"A bounds check in the modem firmware is incorrect, allowing an out-of-bounds write. Per the description, an attacker on the device can cause a local denial of service without extra privileges or user interaction.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","mobile-device","modem"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-02T03:17:33+00:00","first_seen_at":"2026-11-02T03:31:25+00:00","triaged_at":"2026-11-02T03:32:28+00:00","updated_at":"2026-11-02T03:32:28+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-02T03:32:28Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Modem: out-of-bounds write from a bad bounds check crashes the device","impact":"low","summary":"A bounds check in the modem firmware is incorrect, allowing an out-of-bounds write. Per the description, an attacker on the device can cause a local denial of service without extra privileges or user interaction.","audience":"everyone","category":"infrastructure","nicknames":[],"who_cares":["modem","mobile-device"],"confidence":0.5,"fix_status":"unknown","needs_auth":"unknown","worst_case":"Local denial of service from an out-of-bounds write in modem firmware","analyst_note":"Identify the affected device vendor and modem firmware versions, and check the vendor bulletin for Patch ID MOLY01780439 (MediaTek-style ID) for the fixed build.","how_to_check":"unknown","plain_action":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000599,"input_tokens":4098,"output_tokens":378,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2026':16A,19A '-20564':17A,20A '-8901':106C 'addit':89C 'allow':35B 'attack':46B 'bad':9A 'bound':5A,10A,27B,40B,71C,77C 'caus':51B 'check':11A,28B,78C 'could':80C 'crash':12A 'cve':15A,18A 'denial':54B,84C 'descript':44B 'devic':14A,24B,49B 'due':73C 'execut':90C 'exploit':99C 'extra':58B 'firmwar':32B 'id':101C,104C 'incorrect':34B,76C 'infrastructur':21B 'interact':62B,94C 'issu':103C 'lead':81C 'local':53B,83C 'mobil':23B 'mobile-devic':22B 'modem':1A,25B,31B,64C 'moly01780439':102C 'msv':105C 'need':92C,97C 'out-of-bound':2A,37B 'patch':100C 'per':42B 'possibl':68C 'privileg':59B,91C 'servic':56B,86C 'user':61B,93C 'without':57B 'write':6A,41B,72C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"everyone","plain_action":null,"pkeys":[],"ptokens":[],"labels":["infrastructure","mobiledevice","modem","unknown"],"first_public_at":"2026-11-02T03:17:33+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-20564","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20564","severity":null,"published_at":"2026-11-02T03:17:33+00:00","modified_at":"2026-11-02T03:17:33+00:00","first_seen_at":"2026-11-02T03:31:25+00:00","fetched_at":"2026-11-02T03:31:25+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}