Denial of service in SING4G 4GEE ROUTER HH70VB

1) Resource exhaustion

EUVDB-ID: #VU54300

Risk: Medium

CVSSv3.1: 6.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2021-33822

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

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

The vulnerability exists due to application does not properly control consumption of internal resources. A remote attacker can send a specially crafted HTTP request using the slowhttptest tool, trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

4GEE ROUTER HH70VB: HH70_E1_02.00_22

External links

http://github.com/Jian-Xian/CVE-POC/blob/master/CVE-2021-33822.md
http://www.sing4g.com/product-page/4gee-router-hh70vb-4g-300mbps-2lan-32wifi
http://github.com/shekyan/slowhttptest

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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