{"id":"CVE-2026-77708","kind":"vulnerability","aliases":["CVE-2026-77708"],"related":[],"title":"SonicWall SonicOS: pre-auth TACACS+ overflow can crash the firewall","description":"A pre-authentication stack-based buffer overflow vulnerability has been identified in the SonicOS TACACS+ authentication client, which in specific conditions could potentially enable a remote unauthenticated attacker to cause an application level denial of service.","summary":"A stack-based buffer overflow in the SonicOS TACACS+ authentication client can be triggered before login under specific conditions. A remote unauthenticated attacker can cause an application-level denial of service.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["firewall","infrastructure","sonicos","sonicwall","tacacs+"],"not_affected_if":["no-tacacs-auth"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-06T19:17:57+00:00","first_seen_at":"2026-11-06T19:43:49+00:00","triaged_at":"2026-11-06T19:46:07+00:00","updated_at":"2026-11-06T19:46:07+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-06T19:46:07Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"SonicWall SonicOS: pre-auth TACACS+ overflow can crash the firewall","impact":"low","summary":"A stack-based buffer overflow in the SonicOS TACACS+ authentication client can be triggered before login under specific conditions. A remote unauthenticated attacker can cause an application-level denial of service.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["sonicwall","sonicos","firewall","tacacs+"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"Remote attacker causes application-level denial of service on the firewall","analyst_note":"Check the SonicWall advisory for CVE-2026-77708 for affected SonicOS versions, the exact TACACS+ conditions, and the fixed release.","how_to_check":"- unknown","plain_action":"","needs_analyst":true,"not_affected_if":["no-tacacs-auth"],"who_is_affected":"Organisations running SonicWall firewalls on SonicOS with TACACS+ authentication enabled are the exposed systems. The sources do not state the affected versions or the exact conditions that must hold. Sites that do not use TACACS+ for administrator login are likely outside the described path, but the sources do not confirm this.","user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"high"},"cost_usd":0.000667,"input_tokens":4199,"output_tokens":494,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A '-77708':14A,17A 'applic':51B,89C 'application-level':50B 'attack':46B,85C 'auth':5A 'authent':33B,59C,73C 'base':26B,62C 'buffer':27B,63C 'caus':48B,87C 'client':34B,74C 'condit':42B,78C 'could':79C 'crash':9A 'cve':12A,15A 'denial':53B,91C 'enabl':81C 'firewal':11A,18B 'identifi':68C 'infrastructur':19B 'level':52B,90C 'login':39B 'overflow':7A,28B,64C 'potenti':80C 'pre':4A,58C 'pre-auth':3A 'pre-authent':57C 'remot':44B,83C 'servic':55B,93C 'sonico':2A,20B,31B,71C 'sonicwal':1A,21B 'specif':41B,77C 'stack':25B,61C 'stack-bas':24B,60C 'tacac':6A,22B,32B,72C 'trigger':37B 'unauthent':45B,84C 'vulner':65C","nicknames":[],"mitigations":[],"who_affected":"Organisations running SonicWall firewalls on SonicOS with TACACS+ authentication enabled are the exposed systems. The sources do not state the affected versions or the exact conditions that must hold. Sites that do not use TACACS+ for administrator login are likely outside the described path, but the sources do not confirm this.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["firewall","infrastructure","sonicos","sonicwall","tacacs","unknown"],"campaign_type":null,"search_a":"'-2026':13A,16A '-77708':14A,17A 'auth':5A 'crash':9A 'cve':12A,15A 'firewal':11A 'overflow':7A 'pre':4A 'pre-auth':3A 'sonico':2A 'sonicwal':1A 'tacac':6A","search_b":"'applic':51B 'application-level':50B 'attack':46B 'authent':33B 'base':26B 'buffer':27B 'caus':48B 'client':34B 'condit':42B 'denial':53B 'firewal':18B 'infrastructur':19B 'level':52B 'login':39B 'overflow':28B 'remot':44B 'servic':55B 'sonico':20B,31B 'sonicwal':21B 'specif':41B 'stack':25B 'stack-bas':24B 'tacac':22B,32B 'trigger':37B 'unauthent':45B","search_c":"'applic':89C 'attack':85C 'authent':59C,73C 'base':62C 'buffer':63C 'caus':87C 'client':74C 'condit':78C 'could':79C 'denial':91C 'enabl':81C 'identifi':68C 'level':90C 'overflow':64C 'potenti':80C 'pre':58C 'pre-authent':57C 'remot':83C 'servic':93C 'sonico':71C 'specif':77C 'stack':61C 'stack-bas':60C 'tacac':72C 'unauthent':84C 'vulner':65C","first_public_at":"2026-11-06T19:17:57+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-77708","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77708","severity":null,"published_at":"2026-11-06T19:17:57+00:00","modified_at":"2026-11-06T19:17:57+00:00","first_seen_at":"2026-11-06T19:43:49+00:00","fetched_at":"2026-11-06T19:43:49+00:00","note":null}],"documents":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}