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CVE-2021-32976— Moxa NPort IAW5000A-I/O Series Serial Device Server Stack-based Buffer Overflow

Quick assessment

Affected
Moxa NPort IAW5000A-I/O series firmware
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MOXA NPort IAW5000A-I/O Series是中国台湾摩莎（MOXA）公司的一款工业环境下使用的无线设备服务器。该服务器可实现现场串口设备与无线以太网络相集成，并且融合了数字IO，适用于工业数据采集应用。 NPort IAW5000A-I/O Series存在安全漏洞，该漏洞允许远程攻击者可利用该漏洞发起拒绝服务攻击并执行任意代码。

CVSS 9.8 · Critical EPSS 2.79% · P86

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-32976

Vulnerability Information
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Vulnerability Title
Moxa NPort IAW5000A-I/O Series Serial Device Server Stack-based Buffer Overflow
Source: CVE Program / CVE List V5
Vulnerability Description
Five buffer overflows in the built-in web server in Moxa NPort IAW5000A-I/O series firmware version 2.2 or earlier may allow a remote attacker to initiate a denial-of-service attack and execute arbitrary code.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
NPort IAW5000A-I/O Series 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MOXA NPort IAW5000A-I/O Series是中国台湾摩莎（MOXA）公司的一款工业环境下使用的无线设备服务器。该服务器可实现现场串口设备与无线以太网络相集成，并且融合了数字IO，适用于工业数据采集应用。 NPort IAW5000A-I/O Series存在安全漏洞，该漏洞允许远程攻击者可利用该漏洞发起拒绝服务攻击并执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Moxa NPort IAW5000A-I/O series firmware unspecified ~ 2.2 -

II. Public POCs for CVE-2021-32976

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III. Intelligence Information for CVE-2021-32976

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Vendor Advisories for CVE-2021-32976 (1)

Other References for CVE-2021-32976 (1)

Same Patch Batch · Moxa · 2022-04-01 · 4 CVEs total

CVE-2021-32974 9.8 CRITICAL Moxa NPort IAW5000A-I/O Series Serial Device Server Improper Input Validation
CVE-2021-32968 7.5 HIGH Moxa NPort IAW5000A-I/O Series Serial Device Server Classic Buffer Overflow
CVE-2021-32970 7.5 HIGH Moxa NPort IAW5000A-I/O Series Serial Device Server Improper Input Validation

IV. Related Vulnerabilities

Same product: NPort IAW5000A-I/O series firmware
Same vendor: Moxa
Same weakness: CWE-121

V. Comments for CVE-2021-32976

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