SonicWall Email Security Unrestricted Upload of File Vulnerability

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

Technical Severity

CVSS v3.1 Metrics

HIGH

7.2 / 10

Minimal Risk Critical

Vector Specification

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

Exploitation Likelihood

EPSS Prediction

32.60 %

Predictive Probability

Percentile Rank

96.7 th

Documented as more likely to be exploited than 96.7% of known CVEs.

Detection Date

Nov 03, 2021

Remediation Due

Nov 17, 2021

CISA Catalog Active

Threat Analysis

SonicWall Email Security contains an unrestricted upload of file with dangerous type vulnerability that allows a post-authenticated attacker to upload a file to the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20021 and CVE-2021-20023 to achieve privilege escalation.

Remediation Directive

Apply updates per vendor instructions.

Asset Context

Vendor Identity

SonicWall

Affected Product

SonicWall Email Security

Ransomware Status

Campaign Use Known

Weakness Classification

CWE-434

External Intelligence

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2021-20022