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CVE-2021-20016

SonicWall SSLVPN SMA100 SQL Injection

9.8 CRITICALActively exploited (CISA KEV)Used in ransomwareEPSS 40.0%
  1. Published4 Feb 2021
  2. Added to CISA KEV3 Nov 2021
  3. Remediation due17 Nov 2021
Actively exploited (CISA KEV)

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

Added to KEV: 3 Nov 2021Federal remediation due: 17 Nov 2021Used in ransomware

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 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

SonicWall Sma 500vall versions
SonicWall Sma 100 Firmware≥ 10.0.0.0 < 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

Remediation

Fixed in
SonicWall Sma 100 Firmware≥ 10.2.0.5-d-29sv

References

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Frequently asked

Is CVE-2021-20016 being actively exploited?

Yes. CVE-2021-20016 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Nov 2021. It has been used in ransomware campaigns.

How severe is CVE-2021-20016?

CVE-2021-20016 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 40.0% probability of exploitation.

Which products are affected by CVE-2021-20016?

Affected products include SonicWall Sma 500v, SonicWall Sma 100 Firmware, SonicWall Sma 200 Firmware, SonicWall Sma 210 Firmware, SonicWall Sma 400 Firmware, and 1 more.

How do I fix CVE-2021-20016?

Upgrade affected software to a fixed version, for example SonicWall Sma 100 Firmware 10.2.0.5-d-29sv or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-20016 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.