CVE-2021-20035
KEVSonicWall SMA100 Appliances OS Command Injection Vulnerability
Description
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.
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HPublishedSep 27, 2021
Last modifiedJun 17, 2026
Added to KEVApr 16, 2025
Remediation dueMay 7, 2025
References
- psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0022Vendor Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20035US Government Resource
0 recent articles mention this CVE
63
Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 538 days
- CVSS
- 6.5 MEDIUM
- EPSS (30-day exploit probability)
- 4.4% · top 9% of all CVEs
- Weakness
- CWE-78
- Attack vector
- Network, remotely reachable
Recommended actions
- 1.Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.