CVE-2021-20035
Actively exploited. CVE-2021-20035 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-04-16) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
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.
CSIRTS triage
- What
- An OS command injection vulnerability allows a remote authenticated attacker to inject arbitrary commands.
- Who is affected
- Users of SonicWall SMA100 appliances with the vulnerable management interface.
- Urgency
- Immediate remediation is necessary due to active exploitation and critical severity.
- Action
- Apply the latest security patch for SMA100 appliances.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 89% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalexploitedCVE-2021-20035: SonicWall SMA100 Appliances OS Command Injection Vulnerabilitycisa-kev · 2025-04-16
External references
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