CVE-2021-33824

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

An issue was discovered on MOXA Mgate MB3180 Version 2.1 Build 18113012. 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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-400

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://github.com/Jian-Xian/CVE-POC/blob/master/CVE-2021-33824.mdExploit, Third Party Advisory
https://github.com/shekyan/slowhttptestThird Party Advisory
https://www.moxa.com/en/products/industrial-edge-connectivity/protocol-gateways/modbus-tcp-gateways/mgate-mb3180-mb3280-mb3480-seriesProduct, Vendor Advisory
https://github.com/Jian-Xian/CVE-POC/blob/master/CVE-2021-33824.mdExploit, Third Party Advisory
https://github.com/shekyan/slowhttptestThird Party Advisory
https://www.moxa.com/en/products/industrial-edge-connectivity/protocol-gateways/modbus-tcp-gateways/mgate-mb3180-mb3280-mb3480-seriesProduct, Vendor Advisory

Timeline

Published: Jun 18, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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