{"id":"CVE-2026-20577","kind":"vulnerability","aliases":["CVE-2026-20577"],"related":[],"title":"Modem firmware: permission bypass lets a privileged process cause local denial of service","description":"In Modem, there is a possible permission bypass due to a permissions bypass. This could lead to local denial of service if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: MOLY01880753; Issue ID: MSV-9866.","summary":"A permission bypass in the Modem component can cause a local denial of service. An attacker must already hold the System privilege on the device to trigger it.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","mobile-devices","modem"],"not_affected_if":["no-system-privilege-access"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-02T03:17:35+00:00","first_seen_at":"2026-11-02T03:31:25+00:00","triaged_at":"2026-11-02T03:32:18+00:00","updated_at":"2026-11-02T03:32:18+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-02T03:32:18Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Modem firmware: permission bypass lets a privileged process cause local denial of service","impact":"low","summary":"A permission bypass in the Modem component can cause a local denial of service. An attacker must already hold the System privilege on the device to trigger it.","audience":"everyone","category":"infrastructure","nicknames":[],"who_cares":["modem","mobile-devices"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local denial of service after System privilege is already obtained","analyst_note":"Identify affected Modem products and firmware versions and the vendor fix from the NVD entry and the vendor bulletin for MSV-9866.","how_to_check":"unknown","plain_action":"","needs_analyst":true,"not_affected_if":["no-system-privilege-access"],"who_is_affected":"The source describes a local denial of service in the Modem component, reachable only by an attacker who already has System privilege. The sources do not name affected products or versions, so whether a given device is affected is unknown.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"low"},"cost_usd":0.000611,"input_tokens":4098,"output_tokens":403,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2026':15A,18A '-20577':16A,19A '-9866':96C 'actor':76C 'alreadi':42B,78C 'attack':40B 'bypass':4A,27B,59C,64C 'caus':9A,33B 'compon':31B 'could':66C 'cve':14A,17A 'denial':11A,36B,70C 'devic':23B,49B 'due':60C 'exploit':89C 'firmwar':2A 'hold':43B 'id':91C,94C 'infrastructur':20B 'interact':84C 'issu':93C 'lead':67C 'let':5A 'local':10A,35B,69C 'malici':75C 'mobil':22B 'mobile-devic':21B 'modem':1A,24B,30B,53C 'moly01880753':92C 'msv':95C 'must':41B 'need':87C 'obtain':79C 'patch':90C 'permiss':3A,26B,58C,63C 'possibl':57C 'privileg':7A,46B,82C 'process':8A 'servic':13A,38B,72C 'system':45B,81C 'trigger':51B 'user':83C","nicknames":[],"mitigations":[],"who_affected":"The source describes a local denial of service in the Modem component, reachable only by an attacker who already has System privilege. The sources do not name affected products or versions, so whether a given device is affected is unknown.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"everyone","plain_action":null,"pkeys":[],"ptokens":[],"labels":["infrastructure","mobiledevices","modem","unknown"],"first_public_at":"2026-11-02T03:17:35+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-20577","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20577","severity":null,"published_at":"2026-11-02T03:17:35+00:00","modified_at":"2026-11-02T03:17:35+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"}