CVE-2021-20035: SonicWall SMA100 Appliances OS Command Injection Vulnerability
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation 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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Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-20035
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2021-20035Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 89% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2021-20035 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for SonicWall SMA100 Appliances
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- criticalexploitedCVE-2023-44221: SonicWall SMA100 Appliances OS Command Injection Vulnerabilitycisa-kev · 2025-05-01
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