Published: 12/10/2020 Updated: 23/10/2020
CVSS v2 Base Score: 7.5 | Impact Score: 6.4 | Exploitability Score: 10
CVSS v3 Base Score: 9.8 | Impact Score: 5.9 | Exploitability Score: 3.9
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P

Vulnerability Summary

A buffer overflow vulnerability in SonicOS allows a remote malicious user 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,,, SonicOSv 6.5.4.v and Gen 7 version

Vulnerability Trend

Recent Articles

Critical SonicWall vulnerability affects 800K firewalls, patch now
BleepingComputer • Ax Sharma • 16 Oct 2020

A critical stack-based Buffer Overflow vulnerability has been discovered in SonicWall VPNs.
When exploited, it allows unauthenticated remote attackers to execute arbitrary code on the impacted devices.



Critical SonicWall VPN Portal Bug Allows DoS, Worming RCE
Threatpost • Tara Seals • 14 Oct 2020

A critical security bug in the SonicWall VPN portal can be used to crash the device and prevent users from connecting to corporate resources. It could also open the door to remote code execution (RCE), researchers said.
The flaw (CVE-2020-5135) is a stack-based buffer overflow in the SonicWall Network Security Appliance (NSA). According to the researchers at Tripwire who discovered it, the flaw exists within the HTTP/HTTPS service used for product management and SSL VPN remote access.

The Register

A critical vulnerability in a SonicWall enterprise VPN firewall can be exploited to crash the device or remotely execute code on it, reverse engineers said this week.
The stack-based buffer overflow (CVE-2020-5135) uncovered by infosec outfit Tripwire can be triggered by an “unauthenticated HTTP request involving a custom protocol handler” – and, most worryingly, could have been deployed by an “unskilled attacker.”
The biz said about 800,000 devices were discoverable throug...