{"id":"CVE-2021-20016","kind":"vulnerability","aliases":["CVE-2021-20016"],"related":[],"title":"SonicWall SSLVPN SMA100: SonicWall SSLVPN SMA100 SQL Injection Vulnerability","description":"A SQL-Injection vulnerability in the SonicWall SSLVPN SMA100 product allows a remote unauthenticated attacker to perform SQL query to access username password and other session related information. This vulnerability impacts SMA100 build version 10.x.","summary":"SonicWall SMA100 SSL VPN appliances contain a SQL injection flaw that lets a remote, unauthenticated attacker run database queries. The attacker can use it to access credentials stored on the appliance.","severity":"critical","cvss":9.8,"epss":0.40038,"exploited":true,"exploited_at":"2021-11-03T00:00:00+00:00","products":[{"name":"SonicWall SSLVPN SMA100","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","infrastructure","ransomware","self-hosted","sma100","sonicwall","vpn"],"not_affected_if":["no-sma100-appliance"],"how_to_check":null,"fix":"Apply the SonicWall update for the SMA100 appliance per vendor instructions; the sources do not name a fixed version.","status":"open","published_at":"2021-02-04T06:15:13+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T21:41:35+00:00","updated_at":"2026-10-23T21:57:34+00:00","category":"infrastructure","confidence":0.7,"triage":{"at":"2026-10-23T21:41:35Z","model":"claude-haiku-5-5","output":{"fix":"Apply the SonicWall update for the SMA100 appliance per vendor instructions; the sources do not name a fixed version.\nunknown","reach":"internet","impact":"high","summary":"SonicWall SMA100 SSL VPN appliances contain a SQL injection flaw that lets a remote, unauthenticated attacker run database queries. The attacker can use it to access credentials stored on the appliance.","category":"infrastructure","who_cares":["sonicwall","sma100","self-hosted","vpn"],"confidence":0.7,"needs_auth":"no","worst_case":"Unauthenticated attacker reads stored credentials from the VPN appliance","analyst_note":"Find the SonicWall advisory for CVE-2021-20016 to get affected and fixed SMA100 firmware versions and a check method; CISA KEV lists it as known exploited with ransomware use.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["no-sma100-appliance"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000475,"input_tokens":2858,"output_tokens":379,"severity_before":"unknown"},"analyst_status":"queued","analyst_note":"Find the SonicWall advisory for CVE-2021-20016 to get affected and fixed SMA100 firmware versions and a check method; CISA KEV lists it as known exploited with ransomware use.","search":"'-20016':12A,15A '-2021':11A,14A '10':94C 'access':53B,80C 'allow':70C 'applianc':32B,58B 'attack':43B,48B,74C 'build':92C 'contain':33B 'credenti':54B 'cve':10A,13A 'databas':45B 'exploit':19B 'flaw':37B 'host':24B 'impact':90C 'inform':87C 'infrastructur':20B 'inject':8A,36B,62C 'let':39B 'password':82C 'perform':76C 'product':69C 'queri':46B,78C 'ransomwar':21B 'relat':86C 'remot':41B,72C 'run':44B 'self':23B 'self-host':22B 'session':85C 'sma100':3A,6A,18A,25B,29B,68C,91C 'sonicwal':1A,4A,26B,28B,66C 'sonicwall':16A 'sql':7A,35B,61C,77C 'sql-inject':60C 'ssl':30B 'sslvpn':2A,5A,17A,67C 'store':55B 'unauthent':42B,73C 'use':50B 'usernam':81C 'version':93C 'vpn':27B,31B 'vulner':9A,63C,89C 'x':95C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2021-02-04T06:15:13+00:00","kev":{"dateAdded":"2021-11-03","dueDate":"2021-11-17","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Known"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2021-20016","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-20016","severity":null,"published_at":"2021-11-03T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:53+00:00","fetched_at":"2026-10-25T14:39:42+00:00","note":null},{"source":"epss","external_id":"CVE-2021-20016","url":"https://api.first.org/data/v1/epss?cve=CVE-2021-20016","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:43+00:00","fetched_at":"2026-10-23T19:13:43+00:00","note":null},{"source":"nvd","external_id":"CVE-2021-20016","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20016","severity":null,"published_at":"2021-02-04T06:15:13+00:00","modified_at":"2026-08-12T05:17:33+00:00","first_seen_at":"2026-10-23T21:57:34+00:00","fetched_at":"2026-10-23T21:57:34+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"}