Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2021-34595— CODESYS V2 runtime: out-of-bounds read or write access 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。

CVSS 8.1 · High EPSS 0.88% · P58

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2021-34595

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
CODESYS V2 runtime: out-of-bounds read or write access may result in denial-of-service
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用越界的指针偏移
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
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2021-34595

请登录查看更多情报信息。

Other References for CVE-2021-34595 (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-2021-34593 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
Same vendor: CODESYS
Same weakness: CWE-823

V. Comments for CVE-2021-34595

No comments yet

Leave a comment