// For flags

CVE-2021-34595

CODESYS V2 runtime: out-of-bounds read or write access may result in denial-of-service

Severity Score

8.1
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

Una petición diseñada con valores no válidos puede causar un acceso de lectura o escritura fuera de límites en CODESYS V2 Runtime Toolkit 32 Bit full y PLCWinNT versiones anteriores a V2.4.7.56, resultando en una condición de denegación de servicio o una escritura excesiva de memoria local

*Credits: This issue was reported by Chen Jie and Gao Jian of NSFOCUS.
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
Single
Confidentiality
None
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-06-10 CVE Reserved
  • 2021-10-26 CVE Published
  • 2023-05-19 EPSS Updated
  • 2024-09-17 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
  • CWE-823: Use of Out-of-range Pointer Offset
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Codesys
Search vendor "Codesys"
 Plcwinnt
Search vendor "Codesys" for product "Plcwinnt"
 < 2.4.7.56
Search vendor "Codesys" for product "Plcwinnt" and version " < 2.4.7.56"
-
Affected
Codesys
Search vendor "Codesys"
 Runtime Toolkit
Search vendor "Codesys" for product "Runtime Toolkit"
 < 2.4.7.56
Search vendor "Codesys" for product "Runtime Toolkit" and version " < 2.4.7.56"
x86
Affected