Security News > 2020 > October > Critical SonicWall vulnerability affects 800K firewalls, patch now
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.
Tracked as CVE-2020-5135, the vulnerability impacts multiple versions of SonicOS ran by hundreds of thousands of active VPNs. Craig Young of Tripwire Vulnerability and Exposure Research Team and Nikita Abramov of Positive Technologies have been credited with discovering and reporting the vulnerability.
Provided the vast number of devices that are still running the outdated SonicOS versions and the critical nature of this vulnerability, complete research findings on CVE-2020-5135 are expected to be released once enough users have patched their systems.
"SonicWall was contacted by a third-party research team regarding issues related to SonicWall next-generation virtual firewall models that could potentially result in Denial-of-Service attacks and/or cross-site scripting vulnerabilities."
"Immediately upon discovery, SonicWall researchers conducted extensive testing and code review to confirm the third-party research. This analysis lead to the discovery of additional unique vulnerabilities to virtual and hardware appliances requiring Common Vulnerabilities and Exposures listings based on the Common Vulnerability Scoring System. The PSIRT team worked to duplicate the issues and develop, test and release patches for the affected products. At this time, SonicWall is not aware of a vulnerability that has been exploited or that any customer has been impacted," the company told BleepingComputer.
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Related Vulnerability
| DATE | CVE | VULNERABILITY TITLE | RISK |
|---|---|---|---|
| 2020-10-12 | CVE-2020-5135 | Classic Buffer Overflow vulnerability in Sonicwall Sonicos and Sonicosv 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. | 9.8 |