Vulnerability identifier: #VU54104

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20027

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SonicOS
Operating systems & Components / Operating system

Vendor:

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error when processing HTTP headers. A remote attacker can send a specially crafted HTTP request to the system, trigger a buffer overflow and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Note, this vulnerability affects SonicOS Gen5, Gen6, Gen7 platforms, and SonicOSv virtual firewalls.

Vulnerable software versions

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External links
http://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0016

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.