CVE-2021-34595— CODESYS V2 runtime: out-of-bounds read or write access may result in denial-of-service
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I. Basic Information for CVE-2021-34595
Vulnerability Information
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Vulnerability Title
CODESYS V2 runtime: out-of-bounds read or write access may result in denial-of-service
Source: NVD (National Vulnerability Database)
Vulnerability Description
A crafted request with invalid offsets may cause an out-of-bounds read or write access in CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56, resulting in a denial-of-service condition or local memory overwrite.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用越界的指针偏移
Source: NVD (National Vulnerability Database)
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之前的版本存在安全漏洞，该漏洞源于在受影响的软件中，带有无效偏移量的请求可能会导致越界读或写访问，从而导致拒绝服务条件或本地内存覆盖。
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-2021-34595
| # | POC Description | Source Link | Shenlong Link |
|---|
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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-2021-34593 | 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) |
| CVE-2021-34596 | 6.5 MEDIUM | CODESYS V2 runtime: Access of Uninitialized Pointer may result in denial-of-service |
IV. Related Vulnerabilities
Same product: CODESYS V2
- CVE-2021-34596
CODESYS V2 runtime: Access of Uninitialized Pointer may resu - CVE-2021-34593
CODESYS V2 runtime: unauthenticated invalid requests may res - CVE-2021-34586
CODESYS V2 web server: crafted requests could trigger a null - CVE-2021-34585
CODESYS V2 web server: crafted requests could trigger a poin - CVE-2021-34584
CODESYS V2 web server: crafted requests could trigger a buff
Same vendor: CODESYS
- CVE-2026-35225
Improper timeout handling in CODESYS EtherNetIP - CVE-2026-3509
CODESYS Control Audit Log Format String DoS - CVE-2025-41660
CODESYS Control Boot Application Replacement Enables Code Ex - CVE-2026-2364
CODESYS Installer TOCTOU Privilege Escalation - CVE-2025-41700
CODESYS Development System - Deserialization of Untrusted Da
Same weakness: CWE-823
V. Comments for CVE-2021-34595
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