CVE-2021-20035
SonicWall SMA100 Appliances OS Command Injection Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 7 May 2025). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 4.18% probability · 90th percentile
- CISA KEV
- Listed 16 April 2025 · due 7 May 2025
- Weakness
- CWE-78
- Affected
- sonicwall/sma 200 firmware · sonicwall/sma 210 firmware · sonicwall/sma 400 firmware · sonicwall/sma 410 firmware · sonicwall/sma 500v
- Source
- PSIRT@sonicwall.com
CISA notes
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0022 ; https://nvd.nist.gov/vuln/detail/CVE-2021-20035
References
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.