Background exploitation KEV catalog Ransomware No authentication

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…

CheckOps priority index

8.1/10 Patch within 24 h

Severity9.8

Probability4.0

Exploitation5/5

Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.

EPSS · today 40.0% higher than 98.6% of CVEs

CVSS 3.1 9.8 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:

Exploited for 1,826 days 03 Nov 2021

CISA due date 17 Nov 2021 for US federal agencies

Exploitation probability EPSS · FIRST

EPSS probability (%)Percentile among all CVEs

Exploitation signals 5 / 5

KEV catalog (CISA)03 Nov 2021
Exploited in EUVD (ENISA)03 Nov 2021
Used by ransomwareyes
EPSS above 10 %40.0%
No account, over the networkyes

What to do

Fix

Apply the vendor’s fix as soon as it is available.

CISA guidance: Apply updates per vendor instructions.

Meanwhile

Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.

Manufacturers (CRA)

Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained

Description ENISA EUVD

Affected products

SonicWall SMA100SSLVPN SMA100

Affected versions

SMA100 build version 10.x

Weaknesses (CWE)

CWE-89

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

03 Feb 2021
Published
03 Nov 2021
Exploitation reported (ENISA)
03 Nov 2021
Added to the KEV catalog
17 Nov 2021
CISA remediation due date
26 Sept 2026
EPSS peak: 40.0%

References

Other exploited vulnerabilities from the same vendor

CVE-2026-83549SonicWall SMA1000 Appliances OS Command Injection Vulnerability
4.6 · Actively exploited
CVE-2026-83548SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability
6.0 · Actively exploited
CVE-2026-15410SonicWall SMA1000 Appliances Code Injection Vulnerability
5.6 · Actively exploited
CVE-2026-15409SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability
6.6 · Actively exploited
CVE-2025-40602SonicWall SMA1000 Missing Authorization Vulnerability
3.9 · Background exploitation
CVE-2023-44221SonicWall SMA100 Appliances OS Command Injection Vulnerability
7.0 · Background exploitation