What’s Vulnerable › Vulnerabilities

CVE-2021-20041

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 21.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-12-08 · updated 2026-06-17
• Weakness: CWE-835

Description

An unauthenticated and remote adversary can consume all of the device's CPU due to crafted HTTP requests sent to SMA100 /fileshare/sonicfiles/sonicfiles resulting in a loop with unreachable exit condition. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances.

Affected products

• SonicWall Sma 200 Firmware: 9.0.0.11-31sv, 10.2.0.8-37sv, 10.2.1.1-19sv
• SonicWall Sma 210 Firmware: 9.0.0.11-31sv, 10.2.0.8-37sv, 10.2.1.1-19sv
• SonicWall Sma 400 Firmware: 9.0.0.11-31sv, 10.2.0.8-37sv, 10.2.1.1-19sv
• SonicWall Sma 410 Firmware: 9.0.0.11-31sv, 10.2.0.8-37sv, 10.2.1.1-19sv
• SonicWall Sma 500V Firmware: 9.0.0.11-31sv, 10.2.0.8-37sv, 10.2.1.1-19sv

References

• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026
• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026

Get alerted when CVE-2021-20041 or the next vulnerability affects your stack