{"id":"CVE-2026-20561","kind":"vulnerability","aliases":["CVE-2026-20561"],"related":[],"title":"Modem firmware: out-of-bounds write lets a rogue base station crash the phone","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, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01750090; Issue ID: MSV-8908.","summary":"A modem flaw is a missing bounds check that allows an out-of-bounds write. A device that connects to an attacker-controlled rogue base station can be knocked offline remotely, with no user interaction and no extra privileges needed.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["android","cellular","infrastructure","mediatek","modem"],"not_affected_if":["patched-firmware"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-02T03:17:33+00:00","first_seen_at":"2026-11-02T03:31:24+00:00","triaged_at":"2026-11-02T03:32:32+00:00","updated_at":"2026-11-02T03:32:32+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-02T03:32:32Z","model":"claude-haiku-5-5","output":{"fix":"- unknown","reach":"network","title":"Modem firmware: out-of-bounds write lets a rogue base station crash the phone","impact":"low","summary":"A modem flaw is a missing bounds check that allows an out-of-bounds write. A device that connects to an attacker-controlled rogue base station can be knocked offline remotely, with no user interaction and no extra privileges needed.","audience":"everyone","category":"infrastructure","nicknames":[],"who_cares":["modem","cellular","android","mediatek"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"Remote denial of service: the device's modem crashes or stops responding","analyst_note":"Identify which devices and modem firmware versions carry Patch ID MOLY01750090 and the vendor's fixed build; check the vendor bulletin for the MediaTek MOLY advisory.","how_to_check":"- unknown","plain_action":"Install the latest phone software update from your device maker as soon as it is available.","needs_analyst":true,"not_affected_if":["patched-firmware"],"who_is_affected":"Devices with the affected modem firmware that connect to cellular networks are exposed to a rogue base station, such as an IMSI catcher. The sources name a Patch ID (MOLY01750090) but do not list affected devices or versions, so the exact models are unknown. Devices already on a patched build are not affected.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000673,"input_tokens":4119,"output_tokens":522,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2026':17A,20A '-20561':18A,21A '-8908':126C 'addit':109C 'allow':36B 'android':22B 'attack':50B,106C 'attacker-control':49B 'base':11A,53B,101C 'bound':6A,33B,41B,77C,83C 'cellular':23B 'check':34B,84C 'connect':46B,97C 'control':51B,103C 'could':86C 'crash':13A 'cve':16A,19A 'denial':90C 'devic':44B 'due':79C 'execut':110C 'exploit':119C 'extra':66B 'firmwar':2A 'flaw':29B 'id':121C,124C 'infrastructur':24B 'interact':63B,114C 'issu':123C 'knock':57B 'lead':87C 'let':8A 'mediatek':25B 'miss':32B,82C 'modem':1A,26B,28B,70C 'moly01750090':122C 'msv':125C 'need':68B,112C,117C 'offlin':58B 'out-of-bound':3A,38B 'patch':120C 'phone':15A 'possibl':74C 'privileg':67B,111C 'remot':59B,89C 'rogu':10A,52B,100C 'servic':92C 'station':12A,54B,102C 'ue':95C 'user':62B,113C 'write':7A,42B,78C","nicknames":[],"mitigations":[],"who_affected":"Devices with the affected modem firmware that connect to cellular networks are exposed to a rogue base station, such as an IMSI catcher. The sources name a Patch ID (MOLY01750090) but do not list affected devices or versions, so the exact models are unknown. Devices already on a patched build are not affected.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"everyone","plain_action":"Install the latest phone software update from your device maker as soon as it is available.","pkeys":[],"ptokens":[],"labels":["android","cellular","infrastructure","mediatek","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-2026-20561","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20561","severity":null,"published_at":"2026-11-02T03:17:33+00:00","modified_at":"2026-11-02T03:17:33+00:00","first_seen_at":"2026-11-02T03:31:24+00:00","fetched_at":"2026-11-02T03:31:24+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"}