CVE-2021-20016

CRITICAL
9.8
CVSS Score
Published: February 3, 2021 at 08:35 PM UTC
Updated: August 12, 2026 at 05:28 AM UTC
11 products affected across 1 vendorSMA 210 FirmwareSMA 410 FirmwareSMA100 Firmware

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Severity
CRITICAL9.8
Exploitation
CISA KEV
Exploit prediction
EPSS 40%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score40.0%

EPSS (Exploit Prediction Scoring System) estimates a 40.0% chance this CVE is exploited in the wild within the next 30 days — higher than 99% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

SonicWall SSLVPN SMA100 contains a SQL injection vulnerability that allows remote exploitation for credential access by an unauthenticated attacker.

Required Action
Apply updates per vendor instructions.
Ransomware Use
Known
Added to KEV
Nov 3, 2021
Remediation Due
Nov 17, 2021
1808 days overdue

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions
sonicwall-sma-200 (same device)
All versions
sonicwall-sma-210 (same device)
All versions
sonicwall-sma-400 (same device)
All versions
sonicwall-sma-410 (same device)
All versions
10.0.0.0 ≤ v < 10.2.0.5-d-29sv
Affected range stops below 10.2.0.5-d-29sv, so it looks safe — our inference, not a vendor statement
sonicwall-sma-100 (same device)
All versions
All versions
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (2)

US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20016

SSVC — Action Prioritization

SSVCActiveAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

9.8CRITICALCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-89

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