Is CVE-2020-5135 actively exploited?

CVE-2020-5135 has no public evidence of in-the-wild exploitation as of 2025-10-31.

What is the CVSS score for CVE-2020-5135?

CVE-2020-5135 has a CVSS score of 9.8 (CRITICAL severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2020-5135?

Patch guidance is available from sonicwall security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2020-5135.

Fix CVE-2020-5135 - CRITICAL sonicwall sonicos

Q: Which products are affected by CVE-2020-5135?

5 products: sonicwall sonicos, sonicwall sonicos, sonicwall sonicos, sonicwall sonicos, sonicwall sonicosv.

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. 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.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-120 CWE-120

Metadata

Primary Vendor: SONICWALL
Published: 10/12/2020
Last Modified: 10/31/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

sonicwall : sonicossonicwall : sonicossonicwall : sonicossonicwall : sonicossonicwall : sonicosv

Remediation Guidance

Executive Summary

View on NIST NVD