SonicWall SMA 100 Appliances Stack-Based Buffer Overflow Vulnerability

Critical Threat Advisory: This vulnerability is documented in active Ransomware campaigns. Immediate remediation required.

Technical Severity

CVSS v3.1 Metrics

CRITICAL

9.8 / 10

Minimal Risk Critical

Vector Specification

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation Likelihood

EPSS Prediction

94.29 %

Predictive Probability

Percentile Rank

99.9 th

Documented as more likely to be exploited than 99.9% of known CVEs.

Detection Date

Jan 28, 2022

Remediation Due

Feb 11, 2022

CISA Catalog Active

Threat Analysis

SonicWall SMA 100 devies are vulnerable to an unauthenticated stack-based buffer overflow vulnerability where exploitation can result in code execution.

Remediation Directive

Apply updates per vendor instructions.

Asset Context

Vendor Identity

SonicWall

Affected Product

SMA 100 Appliances

Ransomware Status

Campaign Use Known

Weakness Classification

CWE-121

External Intelligence

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2021-20038