#VU54300 Resource exhaustion in 4GEE ROUTER HH70VB - CVE-2021-33822

Vulnerability identifier: #VU54300

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-33822

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
4GEE ROUTER HH70VB
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: sing4g

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

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

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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.