CVEvulnerability

CVE-2020-5135

9.8 CRITICAL Known exploited Published 2020-10-12 Modified 2026-06-17 Official page ↗

CISA Known Exploited Vulnerability

SonicWall SonicOS Buffer Overflow Vulnerability — SonicWall SonicOS

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.

Added to KEV: 2022-03-15
Remediation due: 2022-04-05
Ransomware use: Known
Required action: Apply updates per vendor instructions.
Notes: https://nvd.nist.gov/vuln/detail/CVE-2020-5135

Status: Analyzed
Published: 2020-10-12
Last modified: 2026-06-17
Assigner: [email protected]
CVSS 3.1 ([email protected]): 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0): 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected]): 7.5 HIGH — AV:N/AC:L/Au:N/C:P/I:P/A:P
Weaknesses: CWE-120

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.

Affected configurations

• sonicwall sonicos (<= 6.0.5.3) • sonicwall sonicos (>= 6.5.0.0 <= 6.5.1.11) • sonicwall sonicos (>= 6.5.4.0 <= 6.5.4.7) • sonicwall sonicos 7.0.0.0 • sonicwall sonicosv (<= 6.5.4.4)

Weakness · CWE (1)

CWE-120 Buffer Copy without Checking Size of Input weakness

References