What’s Vulnerable › Vulnerabilities

CVE-2021-33822

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-06-18 · updated 2026-06-17
• Weakness: CWE-400

Description

An issue was discovered on 4GEE ROUTER HH70VB Version HH70_E1_02.00_22. Attackers can use slowhttptest tool to send incomplete HTTP request, which could make server keep waiting for the packet to finish the connection, until its resource exhausted. Then the web server is denial-of-service.

Affected products

• Sing4G 4Gee Router Hh70Vb Firmware: hh70_e1_02.00_22

References

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

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