On 2025-04-16, CISA added CVE-2021-20035 (SonicWall SMA100 Appliances) to its Known Exploited Vulnerabilities (KEV) catalog [2]. The vulnerability is listed in the catalog as "SonicWall SMA100 Appliances OS Command Injection Vulnerability" [2]. CISA requires remediation in accordance with the listed vendor mitigation guidance; see the original text in the body for specific requirements [2].
Backfill: this event became public on Apr 16, 2025 and we added it on Nov 10, 2026. It is not a new event.
CISA Adds SonicWall SMA100 Appliances Vulnerability CVE-2021-20035 to Known Exploited Vulnerabilities Catalog
1 min read
- Disclosed
- Apr 16, 2025
- Published
- Nov 10, 2026
- Last updated
- Nov 8, 2026
- CVSS basis
- Our assessment
- 4.4%, higher than 91% of CVEs
- Exploitation and patch status
- ExploitedKEV
- Attack vector
- Vulnerability status
- Actor type
- Motivation
On this page
30-second summary
What happened
Who is affected
Industries mainly affected: Government, Cross-industry
What to do nowOur advice
CISA requires remediation in accordance with the listed vendor mitigation guidance; see the original text in the body for specific requirements [2].
Timeline
Technical details
CISA KEV Listing Record
CISA added CVE-2021-20035 (SonicWall SMA100 Appliances) to the Known Exploited Vulnerabilities () catalog on 2025-04-16 [2].
Original Technical 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. [2]
Official 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. [2]
Individual Vulnerability Record
The U.S. National Vulnerability Database (NVD) provides an independent vulnerability record and description for CVE-2021-20035 [1].
References
Official / primary3
- [1]
“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.”
- [2]
This site aggregates public information and is not security consulting advice. Test remediation steps before applying.