6.8

CVE-2021-20035: SonicWall SMA100 Appliances OS Command Injection Vulnerability

CVSS: 6.8v2.0MediumKEVAnalyzed
Published 27-09-2021Last modified 21-10-2025
Open JSON

Vulnerability summary

CVE-2021-20035 is a medium (CVSS 6.8) OS Command Injection vulnerability in SonicWall SMA100 Appliances. It is known to be exploited: CISA lists it, first on 16-04-2025. EPSS estimates a 4.18% chance of exploitation in the next 30 days, higher than 90.7% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
6.8/10
010
Medium · v2.0 (NVD)
EPSS score
4.18%
0%100%
Low · 0.00 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 27-09-2021
    PublishedVulnerability first disclosed.
  2. 16-04-2025
    Added to CISA KEVSonicWall SMA100 Appliances OS Command Injection Vulnerability
  3. 07-05-2025
    CISA remediation dueApply mitigations per vendor instructions.
  4. 21-10-2025
    Last modifiedVulnerability information updated.

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 metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

4.18%

Chance of exploitation in the next 30 days

Percentile

91%

Versus all other CVEs

30-day change

0.00 pp

From 4.18% on 18-09-2026

18-09-202618-10-2026
EPSS score
4.18%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
16-04-2025
Federal due date
07-05-2025

CISA required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0022 nvd.nist.gov/vuln/detail/CVE-2021-20035

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Sonicwall6 products
  • sma_200_firmware< 9.0.0.11-31sv | ≥ 10.2.0.0, < 10.2.0.8-37sv | ≥ 10.2.1.0, < 10.2.1.1-19sv
  • sma_210_firmware< 9.0.0.11-31sv | ≥ 10.2.0.0, < 10.2.0.8-37sv | ≥ 10.2.1.0, < 10.2.1.1-19sv
  • sma_400_firmware< 9.0.0.11-31sv | ≥ 10.2.0.0, < 10.2.0.8-37sv | ≥ 10.2.1.0, < 10.2.1.1-19sv
  • sma_410_firmware< 9.0.0.11-31sv | ≥ 10.2.0.0, < 10.2.0.8-37sv | ≥ 10.2.1.0, < 10.2.1.1-19sv
  • sma_500v_firmware< 9.0.0.11-31sv | ≥ 10.2.0.0, < 10.2.0.8-37sv | ≥ 10.2.1.0, < 10.2.1.1-19sv

1 vendor · 6 products

References

2 links