CVE-2021-34585— CODESYS V2 web server: crafted requests could trigger a pointer dereference with an invalid address (DoS)
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I. Basic Information for CVE-2021-34585
Vulnerability Information
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Vulnerability Title
CODESYS V2 web server: crafted requests could trigger a pointer dereference with an invalid address (DoS)
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the CODESYS V2 web server prior to V1.1.9.22 crafted web server requests can trigger a parser error. Since the parser result is not checked under all conditions, a pointer dereference with an invalid address can occur. This leads to a denial of service situation.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加检查的返回值
Source: NVD (National Vulnerability Database)
Vulnerability Title
CODESYS代码问题漏洞
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 web server 1.1.9.22 之前版本存在代码问题漏洞，该漏洞源于精心制作的web服务器请求可能会触发解析器错误。因为软件并不是在所有条件下都检查解析器结果，所以可能会发生带有无效地址的指针解引用。这就导致了拒绝服务的情况。
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 | all web servers ~ V1.1.9.22 | - |
II. Public POCs for CVE-2021-34585
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://www.tenable.com/security/research/tra-2021-47x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2021-34585
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-2021-34583 | 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-2021-34595
CODESYS V2 runtime: out-of-bounds read or write access may r - 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-2021-34584
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-252
- CVE-2026-34065
nimiq-primitives: Node crash due to missing interlink valida - CVE-2026-35344
uutils coreutils dd Silent Data Corruption via Unconditional - CVE-2026-35468
nimiq/core-rs-albatross: Panic in history index request hand - CVE-2026-31830
sigstore-ruby verifier returns success for DSSE bundles with - CVE-2026-28691
ImageMagick has an uninitialized pointer dereference in JBIG
V. Comments for CVE-2021-34585
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