Back to Database
Status published
Medium
CVE-2020-5136
A buffer overflow vulnerability in SonicOS allows an authenticated attacker...
Vulnerability Description
A buffer overflow vulnerability in SonicOS allows an authenticated attacker to cause Denial of Service (DoS) in the SSL-VPN and virtual assist portal, which leads to a firewall crash. This vulnerability affected SonicOS Gen 5 version 5.9.1.7, 5.9.1.13, 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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
THREAT MONITOR
Am I Vulnerable?
Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2020-5136
Credits & Attribution
No credits recorded in the NVD database.
More from SonicWall
View All →CVE-2025-40605
A Path Traversal vulnerability has been identified in the Email...
Unknown
0
CVE-2025-40604
Download of Code Without Integrity Check Vulnerability in the SonicWall...
Unknown
0
CVE-2025-40603
A potential exposure of sensitive information in log files in...
Unknown
0
CVE-2025-40602
A local privilege escalation vulnerability due to insufficient authorization in...
Unknown
0
CVE-2025-40601
A Stack-based buffer overflow vulnerability in the SonicOS SSLVPN service...
Unknown
0
Affected Vendor
SonicWall
View all reports →Affected Software
SonicOS
Vulnerable Versions:
SonicOS 6.5.4.7-79n and earlier, SonicOS 5.9.1.7-2n and earlier, SonicOS 5.9.1.13-5n and earlier, SonicOS 6.5.1.11-4n and earlier, SonicOS 6.0.5.3-93o and earlier, SonicOSv 6.5.4.4-44v-21-794 and earlier, SonicOS 7.0.0.0-1
Timeline
Official Publish:
October 12th, 2020
Last Modified:
August 4th, 2024
Added to House:
July 21st, 2026
CVSS Vectors
V3:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H