Vulnerability identifier: #VU57238

Vulnerability risk: Low

CVSSv3.1: 3.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2021-20031

CWE-ID: CWE-644

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
SonicOS
Operating systems & Components / Operating system

Vendor: SonicWall

Description

The vulnerability allows a remote attacker to perform a spoofing attack.

The vulnerability exists due to insufficient validation of user-supplied input when processing HTTP headers. A remote attacker can send a specially crafted HTTP response with arbitrary Host header value and redirect firewall management users to arbitrary web domains.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SonicOS: 5.9 - 7.0.1-R1283

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External links
http://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0019

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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. However, proof of concept for this vulnerability is available.