PT-2021-3345 · 3S Smart Software Solutions · Codesys V2 Runtime System

Sergey Fedonin · Published 2021-05-25 · Updated 2025-08-15 · CVE-2021-30186

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions CODESYS V2 runtime system SP versions prior to 2.4.7.55

Description The issue is a Heap-based Buffer Overflow in the CODESYS V2 runtime system SP. This can be exploited by a remote attacker to cause a denial of service.

Recommendations For versions prior to 2.4.7.55, update to version 2.4.7.55 or later to resolve the issue.

Fix

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

BDU:2021-03154

CVE-2021-30186

Affected Products

Codesys V2 Runtime System

References · 8

• https://osv.dev/vulnerability/CVE-2021-30186 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-30186 · Security Note
• https://bdu.fstec.ru/vul/2021-03154 · Security Note
• https://customers.codesys.com/index.php · Vendor Advisory
• https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=14725&token=08691519ef764b252630759eff925890176ecd78&download= · Vendor Advisory
• https://t.me/cvenotify/15080 · Telegram Post
• https://xakep.ru/2021/06/04/codesys-flaws · Note
• https://t.me/cveNotify/132527 · Telegram Post