#VU54298 Resource exhaustion in Moxa MGate MB3180 Series - CVE-2021-33823

Vulnerability identifier: #VU54298

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-2021-33823

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Moxa MGate MB3180 Series
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Moxa

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 huge amount of TCP SYN packet to trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Moxa MGate MB3180 Series: 2.1 18113012

---

External links
https://github.com/Jian-Xian/CVE-POC/blob/master/CVE-2021-33823.md
https://www.moxa.com/en/products/industrial-edge-connectivity/protocol-gateways/modbus-tcp-gateways/mgate-mb3180-mb3280-mb3480-series

---

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.