{"id":"CVE-2026-20566","kind":"vulnerability","aliases":["CVE-2026-20566"],"related":[],"title":"Modem firmware: out-of-bounds write lets a rogue base station crash devices","description":"In Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, if a malicious actor has already obtained the System privilege. User interaction is needed for exploitation. Patch ID: MOLY01923663 / ALPS11315955; Issue ID: MSV-10866.","summary":"A missing bounds check in the modem firmware allows an out-of-bounds write. A device that has connected to an attacker-controlled rogue base station, and where the attacker already holds System privilege, can be knocked offline remotely.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["android","infrastructure","mobile-devices","modem"],"not_affected_if":["no-rogue-base-station-exposure"],"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":"2026-11-02T03:32:27+00:00","updated_at":"2026-11-02T03:32:27+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-02T03:32:27Z","model":"claude-haiku-5-5","output":{"fix":"- unknown","reach":"network","title":"Modem firmware: out-of-bounds write lets a rogue base station crash devices","impact":"low","summary":"A missing bounds check in the modem firmware allows an out-of-bounds write. A device that has connected to an attacker-controlled rogue base station, and where the attacker already holds System privilege, can be knocked offline remotely.","audience":"everyone","category":"infrastructure","nicknames":[],"who_cares":["modem","mobile-devices","android"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"remote denial of service on a connected device","analyst_note":"Find which device models and firmware builds carry patch MOLY01923663 / ALPS11315955 (MediaTek ALPS/MOLY, Android bulletin) and whether a device update is available.","how_to_check":"- unknown","plain_action":"","needs_analyst":true,"not_affected_if":["no-rogue-base-station-exposure"],"who_is_affected":"The flaw is in modem firmware on affected devices, and exploitation needs an attacker who already has System privilege and a rogue base station. The sources name a patch ID (MOLY01923663 / ALPS11315955) but do not map it to specific device models or versions, so whether a given phone is affected is unknown.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.00066,"input_tokens":4133,"output_tokens":494,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-10866':129C '-2026':16A,19A '-20566':17A,20A 'actor':109C 'allow':35B 'alps11315955':125C 'alreadi':59B,111C 'android':21B 'attack':50B,58B,105C 'attacker-control':49B 'base':11A,53B,100C 'bound':6A,29B,40B,76C,82C 'check':30B,83C 'connect':46B,96C 'control':51B,102C 'could':85C 'crash':13A 'cve':15A,18A 'denial':89C 'devic':14A,25B,43B 'due':78C 'exploit':121C 'firmwar':2A,34B 'hold':60B 'id':123C,127C 'infrastructur':22B 'interact':117C 'issu':126C 'knock':65B 'lead':86C 'let':8A 'malici':108C 'miss':28B,81C 'mobil':24B 'mobile-devic':23B 'modem':1A,26B,33B,69C 'moly01923663':124C 'msv':128C 'need':119C 'obtain':112C 'offlin':66B 'out-of-bound':3A,37B 'patch':122C 'possibl':73C 'privileg':62B,115C 'remot':67B,88C 'rogu':10A,52B,99C 'servic':91C 'station':12A,54B,101C 'system':61B,114C 'ue':94C 'user':116C 'write':7A,41B,77C","nicknames":[],"mitigations":[],"who_affected":"The flaw is in modem firmware on affected devices, and exploitation needs an attacker who already has System privilege and a rogue base station. The sources name a patch ID (MOLY01923663 / ALPS11315955) but do not map it to specific device models or versions, so whether a given phone is affected is unknown.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"everyone","plain_action":null,"pkeys":[],"ptokens":[],"labels":["android","infrastructure","mobiledevices","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-2026-20566","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20566","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"}