Vulnerability Intelligence Report
SonicWall SonicOS Buffer Overflow Vulnerability
CVE-2020-5135
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. This vulnerability affected SonicOS Gen 6 version 6.5.4.7, 6.5.1.12, 6.0.5.3, SonicOSv 6.5.4.v and Gen 7 version 7.0.0.0.
CISA KEV
SSVC: Active Exploitation
Automatable
CVSS Base Score
9.8
CRITICAL
Exploitability:3.9
Impact Score:5.9
EPSS Probability:26.87%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-120 ↗CWE-120: Buffer Copy without Checking Size of Input
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| SonicWall | SonicOS | SonicOS 6.5.4.7-79n and earlier (affected), SonicOS 6.5.1.11-4n and earlier (affected), SonicOS 6.0.5.3-93o and earlier (affected), SonicOSv 6.5.4.4-44v-21-794 and earlier (affected), SonicOS 7.0.0.0-1 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | SonicWall, Inc. · Vendor · USA |
| Reserved | 2019-12-31T00:00:00 |
| Published | 2020-10-12T10:40:28 |
| Last Updated | 2025-10-21T23:35:35 |
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