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CVE-2021-34596— CODESYS V2 runtime: Access of Uninitialized Pointer may result in denial-of-service

Quick assessment

Affected
CODESYS CODESYS V2
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.

CODESYS是德国3S-Smart Software Solutions的一套控制器开发系统 CODESYS V2 Runtime Toolkit 32 Bit full和PLCWinNT V2.4.7.56之前的版本存在缓冲区错误漏洞，该漏洞源于在受影响的软件中，一个精心制作的请求可能会导致对一个未初始化的指针的读访问，从而导致拒绝服务的条件。

CVSS 6.5 · Medium EPSS 0.85% · P58

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-34596

Vulnerability Information
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Vulnerability Title
CODESYS V2 runtime: Access of Uninitialized Pointer may result in denial-of-service
Source: CVE Program / CVE List V5
Vulnerability Description
A crafted request may cause a read access to an uninitialized pointer in CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56, resulting in a denial-of-service condition.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用未经初始化的指针
Source: CVE Program / CVE List V5
Vulnerability Title
CODESYS 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CODESYS是德国3S-Smart Software Solutions的一套控制器开发系统 CODESYS V2 Runtime Toolkit 32 Bit full和PLCWinNT V2.4.7.56之前的版本存在缓冲区错误漏洞，该漏洞源于在受影响的软件中，一个精心制作的请求可能会导致对一个未初始化的指针的读访问，从而导致拒绝服务的条件。
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
CODESYS CODESYS V2 Runtime Toolkit 32 bit full ~ V2.4.7.56 -

II. Public POCs for CVE-2021-34596

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III. Intelligence Information for CVE-2021-34596

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Other References for CVE-2021-34596 (1)

Same Patch Batch · CODESYS · 2021-10-26 · 7 CVEs total

CVE-2021-34584 9.1 CRITICAL CODESYS V2 web server: crafted requests could trigger a buffer over-read (DoS)
CVE-2021-34595 8.1 HIGH CODESYS V2 runtime: out-of-bounds read or write access may result in denial-of-service
CVE-2021-34593 7.5 HIGH CODESYS V2 runtime: unauthenticated invalid requests may result in denial-of-service
CVE-2021-34586 7.5 HIGH CODESYS V2 web server: crafted requests could trigger a null pointer dereference (DoS)
CVE-2021-34585 7.5 HIGH CODESYS V2 web server: crafted requests could trigger a pointer dereference with an invali
CVE-2021-34583 7.5 HIGH CODESYS V2 web server: crafted requests could trigger a heap-based buffer overflow (DoS)

IV. Related Vulnerabilities

Same product: CODESYS V2
Same vendor: CODESYS
Same weakness: CWE-824

V. Comments for CVE-2021-34596

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