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CVE-2021-43083— Apache PLC4X 0.9.0 Buffer overflow in PLC4C via crafted server response

Quick assessment

Affected
Apache Software Foundation Apache PLC4X
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.

Apache PLC4X - PLC4C是美国阿帕奇（Apache）基金会的一个工业通信协议通用适配器。 Apache PLC4X-PLC4C（只有C语言版本受到影响）0.9.1之前版本存在安全漏洞。要利用此漏洞，用户必须主动连接到恶意设备，该设备可能发送包含无效内容的响应。目前，我们认为该漏洞被利用的概率非常小，但这种情况在未来可能会改变，特别是随着工业网络越来越多地结合在一起。

AI Predicted 4.9 Difficulty: Hard EPSS 1.92% · P79

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-43083

Vulnerability Information
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Vulnerability Title
Apache PLC4X 0.9.0 Buffer overflow in PLC4C via crafted server response
Source: CVE Program / CVE List V5
Vulnerability Description
Apache PLC4X - PLC4C (Only the C language implementation was effected) was vulnerable to an unsigned integer underflow flaw inside the tcp transport. Users should update to 0.9.1, which addresses this issue. However, in order to exploit this vulnerability, a user would have to actively connect to a mallicious device which could send a response with invalid content. Currently we consider the probability of this being exploited as quite minimal, however this could change in the future, especially with the industrial networks growing more and more together.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
内存缓冲区边界内操作的限制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Apache PLC4X - PLC4C 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache PLC4X - PLC4C是美国阿帕奇（Apache）基金会的一个工业通信协议通用适配器。 Apache PLC4X-PLC4C（只有C语言版本受到影响）0.9.1之前版本存在安全漏洞。要利用此漏洞，用户必须主动连接到恶意设备，该设备可能发送包含无效内容的响应。目前，我们认为该漏洞被利用的概率非常小，但这种情况在未来可能会改变，特别是随着工业网络越来越多地结合在一起。
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
Apache Software Foundation Apache PLC4X PLC4C ~ 0.9.0 -

II. Public POCs for CVE-2021-43083

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III. Intelligence Information for CVE-2021-43083

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Mailing List Discussions for CVE-2021-43083 (2)

IV. Related Vulnerabilities

Same vendor: Apache Software Foundation
Same weakness: CWE-119

V. Comments for CVE-2021-43083

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