Vulnerability Report

CVE-2021-30186

Title: CODESYS V2 runtime system SP Heap-based Buffer Overflow

Buffer Overflow

Proof Of Concept

No public PoC currently indexed for CVE-2021-30186.

CWE Category CWE-787

Published Date May 25, 2021

Modified Date Aug 15, 2025

Exploit Status Not Found

Score 7.5 CVSS v3.1

Exploit Probability (EPSS)

7.36%

Vulnerability Summary

CVE-2021-30186: CODESYS V2 runtime system SP before 2.4.7.55 has a Heap-based Buffer Overflow.

Impacted Vendors

wago 27

codesys 2

Reference Links

https://customers.codesys.com/index.php https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=14725&token=08691519ef764b252630759eff925890176ecd78&download= https://customers.codesys.com/index.php https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=14725&token=08691519ef764b252630759eff925890176ecd78&download=

CVSS v3.1

Source Entity [email protected]

Severity HIGH

7.5

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v2.0

Source Entity [email protected]

Severity MEDIUM

5.0

Access Vector

N/A

Authentication

N/A

RAW VECTOR AV:N/AC:L/Au:N/C:N/I:N/A:P

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2021-30186 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

August 15, 2025 MODIFIED

Vulnerability data or affected products updated.

May 25, 2021 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Stack

No specific products linked.