{"id":"CVE-2026-20549","kind":"vulnerability","aliases":["CVE-2026-20549"],"related":[],"title":"Modem: out-of-bounds write lets a rogue base station escalate privilege","description":"In Modem, there is a possible out of bounds write due to improper input validation. This could lead to remote escalation of privilege, 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: MOLY01775865; Issue ID: MSV-8895.","summary":"A flaw in the modem firmware lets a phone or device that connects to a rogue base station be hit with an out-of-bounds memory write. Per the description, this can lead to remote escalation of privilege 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","mobile-devices","modem"],"not_affected_if":["no-cellular-modem"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-02T03:17:31+00:00","first_seen_at":"2026-11-02T03:31:24+00:00","triaged_at":"2026-11-02T03:33:55+00:00","updated_at":"2026-11-02T03:33:55+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-02T03:33:55Z","model":"claude-haiku-5-5","output":{"fix":"- unknown","reach":"network","title":"Modem: out-of-bounds write lets a rogue base station escalate privilege","impact":"high","summary":"A flaw in the modem firmware lets a phone or device that connects to a rogue base station be hit with an out-of-bounds memory write. Per the description, this can lead to remote escalation of privilege with no user interaction and no extra privileges needed.","audience":"everyone","category":"infrastructure","nicknames":[],"who_cares":["modem","cellular","mobile-devices","android"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"attacker gains elevated privileges on the device via a rogue base station","analyst_note":"Identify the affected chipset and device list and the fixed firmware or patch level for Patch ID MOLY01775865 and Issue ID MSV-8895 from the vendor bulletin.","how_to_check":"- unknown","plain_action":"Install the latest phone software update from your device maker as soon as one covering this modem fix is available.","needs_analyst":true,"not_affected_if":["no-cellular-modem"],"who_is_affected":"Devices with the affected modem firmware that can connect to a cellular base station are exposed, and an attacker must set up a rogue base station nearby. The sources do not name the affected chipset or devices, so the exact scope is unknown.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000665,"input_tokens":4118,"output_tokens":506,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2026':15A,18A '-20549':16A,19A '-8895':131C 'addit':114C 'android':20B 'attack':111C 'base':10A,43B,106C 'bound':5A,52B,83C 'cellular':21B 'connect':39B,102C 'control':108C 'could':91C 'cve':14A,17A 'descript':57B 'devic':25B,37B 'due':85C 'escal':12A,63B,95C 'execut':115C 'exploit':124C 'extra':72B 'firmwar':32B 'flaw':28B 'hit':46B 'id':126C,129C 'improp':87C 'infrastructur':22B 'input':88C 'interact':69B,119C 'issu':128C 'lead':60B,92C 'let':7A,33B 'memori':53B 'mobil':24B 'mobile-devic':23B 'modem':1A,26B,31B,76C 'moly01775865':127C 'msv':130C 'need':74B,117C,122C 'out-of-bound':2A,49B 'patch':125C 'per':55B 'phone':35B 'possibl':80C 'privileg':13A,65B,73B,97C,116C 'remot':62B,94C 'rogu':9A,42B,105C 'station':11A,44B,107C 'ue':100C 'user':68B,118C 'valid':89C 'write':6A,54B,84C","nicknames":[],"mitigations":[],"who_affected":"Devices with the affected modem firmware that can connect to a cellular base station are exposed, and an attacker must set up a rogue base station nearby. The sources do not name the affected chipset or devices, so the exact scope is unknown.","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 one covering this modem fix is available.","pkeys":[],"ptokens":[],"labels":["android","cellular","infrastructure","mobiledevices","modem","unknown"],"first_public_at":"2026-11-02T03:17:31+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-20549","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20549","severity":null,"published_at":"2026-11-02T03:17:31+00:00","modified_at":"2026-11-02T03:17:31+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"}