{"id":"CVE-2021-20016","published":"2021-02-04T06:15:13Z","modified":"2026-08-12T05:17:33Z","title":"SonicWall SSLVPN SMA100 SQL Injection Vulnerability","vendor":"SonicWall","product":"SSLVPN SMA100","tier":"core","eol":null,"description":{"text":"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.","provenance":"source","from":"NVD"},"summary":{"text":"The SonicWall SSLVPN SMA100 product contains an SQL injection flaw, classed as improper neutralization of special elements used in an SQL command, affecting build version 10.x. A remote attacker with no authentication and no user interaction, reaching the appliance over the network, can run SQL queries to access usernames, passwords, and other session-related information.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-29T07:54:04Z"},"cvss":{"score":9.8,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.40038,"percentile":0.98628,"date":"2026-10-29","provenance":"source"},"kev":{"dateAdded":"2021-11-03","dueDate":"2021-11-17","ransomware":true,"requiredAction":"Apply updates per vendor instructions.","notes":"https://nvd.nist.gov/vuln/detail/CVE-2021-20016","provenance":"source"},"vulncheckKev":{"dateAdded":"2021-04-29","exploitedFirstSeen":"2021-04-29","ransomware":true,"evidence":[{"url":"https://www.mandiant.com/resources/unc2447-sombrat-and-fivehands-ransomware-sophisticated-financial-threat","date":"2021-04-29"},{"url":"https://www.fireeye.com/blog/threat-research/2021/05/shining-a-light-on-darkside-ransomware-operations.html","date":"2021-05-11"},{"url":"https://www.mandiant.com/resources/blog/shining-a-light-on-darkside-ransomware-operations","date":"2021-05-11"},{"url":"https://www.crowdstrike.com/blog/how-ecrime-groups-leverage-sonicwall-vulnerability-cve-2019-7481/","date":"2021-06-08"},{"url":"https://cybersecurityworks.com/blog/ransomware/fivehands-ransomware-attack-analysis-and-risk-based-approach-to-prevention.html","date":"2021-06-09"},{"url":"https://cybersecurityworks.com/blog/ransomware/darkside-ransomware-threat-associations-unearthed.html","date":"2021-06-30"},{"url":"https://unit42.paloaltonetworks.com/revil-threat-actors/","date":"2021-07-06"},{"url":"https://cybersecurityworks.com/howdymanage/uploads/file/ransomware_index-update-q221-csw.pdf","date":"2021-08-16"},{"url":"https://www.ic3.gov/Media/News/2021/211029.pdf","date":"2021-10-28"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2021-11-03"}],"evidenceTotal":26,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"},{"name":"Actively_Exploited_Kev | Oct 18, 2026","url":"https://otx.alienvault.com/pulse/6ad38c22e1848f8189d1c121","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-89","name":"Improper Neutralization of Special Elements used in an SQL Command"}],"references":[{"url":"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0001","tags":["Mitigation","Vendor Advisory"]},{"url":"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0001","tags":["Mitigation","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20016","tags":["US Government Resource"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing 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information","start":113,"end":196}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[{"id":"SRC-f144807c3c05fbc98a1a","title":"Ransomware as a service: Understanding the cybercrime gig economy and how to protect yourself","publisher":"microsoft.com","url":"https://www.microsoft.com/en-us/security/blog/2022/05/09/ransomware-as-a-service-understanding-the-cybercrime-gig-economy-and-how-to-protect-yourself/","date":"2022-05-09","mentions":[{"quote":"SonicWall SSLVPN affected by CVE-2021-20016","start":62395,"end":62438}]}],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2021-7479","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-7479","exploited":true,"exploitedSince":"2021-11-03","provenance":"source"},"exploits":[],"exploitSources":null,"exploitRefs":[],"flow":[{"stage":"exploitation","techniques":["T1190"],"provenance":"ai"},{"stage":"primary","techniques":["T1005"],"provenance":"ai"}],"timeline":[{"date":"2021-02-04","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20016","provenance":"source"},{"date":"2021-04-29","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://www.mandiant.com/resources/unc2447-sombrat-and-fivehands-ransomware-sophisticated-financial-threat","provenance":"source"},{"date":"2021-11-03","kind":"kev","label":"Added to CISA KEV (known ransomware 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