Home/CVE/SonicWall SSLVPN SMA100 SQL Injection Vulnerability
CVE

CVE-2021-20016

SonicWall SSLVPN SMA100 SQL Injection Vulnerability

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.

CRITICAL · CVSS 9.8 ⚠ CISA KEV EPSS 0.79818 Ransomware: known
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • Linked to known ransomware campaigns
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 1% of all CVEs by exploitation likelihood
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules10 YARA rules0
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Required Remediation

Apply updates per vendor instructions.

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Threat Actors Linked

1
actorDarkSide / BlackMatter
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Weakness Classification

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
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Affected Products & Versions

6
sonicwall sma 100 firmware>= 10.0.0.0 and < 10.2.0.5-d-29sv
sonicwall sma 200 firmwareall versions
sonicwall sma 210 firmwareall versions
sonicwall sma 400 firmwareall versions
sonicwall sma 410 firmwareall versions
sonicwall sma 500vall versions
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Detection Rules (IDS/IPS)

3
et-openET EXPLOIT [ConnectWise CRU] Potential Sonicwall SMA Authentication Bypass (management) (CVE-2021-20016)web-application-attack
et-openET EXPLOIT [ConnectWise CRU] Potential Sonicwall SMA User-Level Authentication Bypass (sslvpnclient) (CVE-2021-20016)web-application-attack
et-openET EXPLOIT [ConnectWise CRU] Potential Sonicwall SMA User-Level Authentication Bypass (portal) (CVE-2021-20016)web-application-attack
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
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Sigma Hunt Rules

10
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
relatedcriticalAntivirus Password Dumper Detection
relatedcriticalHacktool Execution - Imphash
relatedcriticalHackTool - Rubeus Execution
relatedcriticalPotential Credential Dumping Via LSASS Process Clone
relatedcriticalWCE wceaux.dll Access
relatedcriticalHackTool - Dumpert Process Dumper Default File
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Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · PSIRT@sonicwall.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD04 Feb 2021 · 06:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
cisaKEV-CVE-2021-20016
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0001MitigationVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20016US Government Resource
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