CVE-2021-20041

moderate-risk

Published 2021-12-08

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.

Do I need to act?

0.60% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 7.5/10 High

NETWORK / LOW complexity

Affected Products (15)

Sma 200 Firmware

Sma 210 Firmware

Sma 410 Firmware

Sma 400 Firmware

Sma 500V Firmware

Affected Vendors

Sonicwall

References (2)

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

/ 100

moderate-risk

Severity 26/34 · High

Exploitability 2/34 · Minimal

Exposure 18/34 · Moderate