CVE-2021-20016
SonicWall SSLVPN SMA100 SQL Injection Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 17 November 2021). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 40.04% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 3 November 2021 · due 17 November 2021 · used in ransomware campaigns
- Weakness
- CWE-89
- Affected
- sonicwall/sma 100 firmware · sonicwall/sma 200 firmware · sonicwall/sma 210 firmware · sonicwall/sma 400 firmware · sonicwall/sma 410 firmware · sonicwall/sma 500v
- Source
- PSIRT@sonicwall.com
EPSS 40.0% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2021-20016
References
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0001Mitigation, Vendor Advisory
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0001Mitigation, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20016US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.