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Almost 800,000 SonicWall VPN appliances online are vulnerable to CVE-2020-5135

October 16, 2020

Security experts from the Tripwire VERT security team have discovered 795,357 SonicWall VPN appliances that were exposed online that are vulnerable to the CVE-2020-5135 RCE flaw.

“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,,, SonicOSv 6.5.4.v and Gen 7 version” reads the advisory published by SonicWall.

The CVE-2020-5135 is a stack-based buffer overflow that affects the SonicWall Network Security Appliance (NSA). The vulnerability can be exploited by an unauthenticated HTTP request involving a custom protocol handler.

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