{"id":"CVE-2026-20554","kind":"vulnerability","aliases":["CVE-2026-20554"],"related":[],"title":"Modem: missing bounds check lets a rogue base station crash the phone","description":"In Modem, there is a possible system crash due to a missing bounds check. 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 needed for exploitation. Patch ID: MOLY01911177; Issue ID: MSV-10122.","summary":"A missing bounds check in the modem firmware can crash the modem when a phone connects to a rogue base station the attacker controls. The description also says it could lead to remote privilege escalation, with no extra execution privileges needed.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["cellular","infrastructure","mobile-devices","modem"],"not_affected_if":["no-cellular-connection"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-02T03:17:32+00:00","first_seen_at":"2026-11-02T03:31:24+00:00","triaged_at":"2026-11-02T03:32:37+00:00","updated_at":"2026-11-02T03:32:37+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-02T03:32:37Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Modem: missing bounds check lets a rogue base station crash the phone","impact":"high","summary":"A missing bounds check in the modem firmware can crash the modem when a phone connects to a rogue base station the attacker controls. The description also says it could lead to remote privilege escalation, with no extra execution privileges needed.","audience":"everyone","category":"infrastructure","nicknames":[],"who_cares":["modem","mobile-devices","cellular"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"Modem crashes, and possibly remote privilege escalation on the device","analyst_note":"Find the affected device and modem firmware list and the vendor patch level for Patch ID MOLY01911177 (MediaTek advisory, Issue MSV-10122).","how_to_check":"unknown","plain_action":"Install the latest phone software update from your device maker as soon as it is available, since the sources do not name a fixed version.","needs_analyst":true,"not_affected_if":["no-cellular-connection"],"who_is_affected":"Phones and devices with the affected Modem firmware that connect to cellular networks; the attack needs a rogue base station near the device. Sources do not name exact models or versions, so unknown.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000651,"input_tokens":4115,"output_tokens":479,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-10122':120C '-2026':14A,17A '-20554':15A,18A 'addit':104C 'also':51B 'attack':47B,101C 'base':8A,44B,96C 'bound':3A,27B,78C 'cellular':19B 'check':4A,28B,79C 'connect':40B,92C 'control':48B,98C 'could':54B,81C 'crash':10A,34B,73C 'cve':13A,16A 'descript':50B 'devic':23B 'due':74C 'escal':59B,85C 'execut':63B,105C 'exploit':113C 'extra':62B 'firmwar':32B 'id':115C,118C 'infrastructur':20B 'interact':109C 'issu':117C 'lead':55B,82C 'let':5A 'miss':2A,26B,77C 'mobil':22B 'mobile-devic':21B 'modem':1A,24B,31B,36B,67C 'moly01911177':116C 'msv':119C 'need':65B,107C,111C 'patch':114C 'phone':12A,39B 'possibl':71C 'privileg':58B,64B,87C,106C 'remot':57B,84C 'rogu':7A,43B,95C 'say':52B 'station':9A,45B,97C 'system':72C 'ue':90C 'user':108C","nicknames":[],"mitigations":[],"who_affected":"Phones and devices with the affected Modem firmware that connect to cellular networks; the attack needs a rogue base station near the device. Sources do not name exact models or versions, so 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 it is available, since the sources do not name a fixed version.","pkeys":[],"ptokens":[],"labels":["cellular","infrastructure","mobiledevices","modem","unknown"],"first_public_at":"2026-11-02T03:17:32+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-20554","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20554","severity":null,"published_at":"2026-11-02T03:17:32+00:00","modified_at":"2026-11-02T03:17:32+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"}