CVE-2020-5135Actively exploitedAdded to KEV 2022-03-15Known ransomware campaign use

SonicWall SonicOS Buffer Overflow Vulnerability

SonicWall, SonicOS

Description

A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code by sending a malicious request to the firewall.

CVSS severity for this advisory hasn't been enriched from NVD yet, check back shortly.

EPSS, exploit probability

High

26.9%

estimated chance of real-world exploitation in the next 30 days, higher than 98.0% of every CVE FIRST.org scores

Refreshed 10/28/2026, via FIRST.org's EPSS model, not CVSS, this measures likelihood of exploitation, not how severe it would be.

Required action

Apply updates per vendor instructions.

CISA-recommended due date: 2022-04-05

CWE-120

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