// For flags

CVE-2021-34583

CODESYS V2 web server: crafted requests could trigger a heap-based buffer overflow (DoS)

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

Crafted web server requests may cause a heap-based buffer overflow and could therefore trigger a denial-of- service condition due to a crash in the CODESYS V2 web server prior to V1.1.9.22.

Unas peticiones del servidor web diseñadas pueden causar un desbordamiento del búfer en la región heap de la memoria y, por tanto, podrían desencadenar una situación de denegación de servicio debido a un bloqueo en el servidor web de CODESYS V2 versiones anteriores a 1.1.9.22

*Credits: This vulnerability was discovered by Tenable Research.
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
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
  • 2024-07-10 EPSS Updated
  • 2024-09-16 CVE Updated
  • 2024-09-16 First Exploit
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-122: Heap-based Buffer Overflow
  • CWE-787: Out-of-bounds Write
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"
 Codesys
Search vendor "Codesys" for product "Codesys"
 < 1.1.9.22
Search vendor "Codesys" for product "Codesys" and version " < 1.1.9.22"
-
Affected