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CVE-2021-20035

SonicWall SMA100 Appliances OS Command Injection

6.5 MEDIUMActively exploited (CISA KEV)EPSS 4.18%
  1. Published27 Sept 2021
  2. Added to CISA KEV16 Apr 2025
  3. Remediation due7 May 2025
Actively exploited (CISA KEV)

SonicWall SMA100 appliances contain an OS command injection vulnerability in the management interface that allows a remote authenticated attacker to inject arbitrary commands as a 'nobody' user, which could potentially lead to code execution.

Added to KEV: 16 Apr 2025Federal remediation due: 7 May 2025

Description

Improper neutralization of special elements in the SMA100 management interface allows a remote authenticated attacker to inject arbitrary commands as a 'nobody' user which potentially leads to DoS.

CVSS 3.1 breakdown

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

Affected products

SonicWall Sma 500v≥ 10.2.0.0 < 10.2.0.8-37sv · ≥ 10.2.1.0 < 10.2.1.1-19sv · < 9.0.0.11-31sv
SonicWall Sma 200 Firmware≥ 10.2.0.0 < 10.2.0.8-37sv · ≥ 10.2.1.0 < 10.2.1.1-19sv · < 9.0.0.11-31sv
SonicWall Sma 210 Firmware≥ 10.2.0.0 < 10.2.0.8-37sv · ≥ 10.2.1.0 < 10.2.1.1-19sv · < 9.0.0.11-31sv
SonicWall Sma 400 Firmware≥ 10.2.0.0 < 10.2.0.8-37sv · ≥ 10.2.1.0 < 10.2.1.1-19sv · < 9.0.0.11-31sv
SonicWall Sma 410 Firmware≥ 10.2.0.0 < 10.2.0.8-37sv · ≥ 10.2.1.0 < 10.2.1.1-19sv · < 9.0.0.11-31sv

Remediation

Fixed in
SonicWall Sma 500v≥ 10.2.0.8-37sv
SonicWall Sma 200 Firmware≥ 10.2.0.8-37sv
SonicWall Sma 210 Firmware≥ 10.2.0.8-37sv
SonicWall Sma 400 Firmware≥ 10.2.0.8-37sv
SonicWall Sma 410 Firmware≥ 10.2.0.8-37sv

References

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Frequently asked

Is CVE-2021-20035 being actively exploited?

Yes. CVE-2021-20035 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 16 Apr 2025.

How severe is CVE-2021-20035?

CVE-2021-20035 has a CVSS 3.1 base score of 6.5, rated medium. EPSS estimates a 4.18% probability of exploitation.

Which products are affected by CVE-2021-20035?

Affected products include SonicWall Sma 500v, SonicWall Sma 200 Firmware, SonicWall Sma 210 Firmware, SonicWall Sma 400 Firmware, SonicWall Sma 410 Firmware.

How do I fix CVE-2021-20035?

Upgrade affected software to a fixed version, for example SonicWall Sma 500v 10.2.0.8-37sv, SonicWall Sma 200 Firmware 10.2.0.8-37sv, SonicWall Sma 210 Firmware 10.2.0.8-37sv or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-20035 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.