Denial of service in SonicOS

1) Buffer overflow

EUVDB-ID: #VU54104

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 - Memory corruption

Exploit availability: No

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

SonicOS: before 7.0.1-R579

External links

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

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.