CVE-2021-30186

HIGH 7.5CVE-2021-30186 · Published 25/05/2021 · updated 17/06/2026

In short

CVE-2021-30186 is a HIGH (CVSS 7.5) vulnerability affecting plcwinnt (codesys), runtime toolkit (codesys).
Chance of exploitation in the next 30 days (EPSS): 7.7%, higher than 94.6% of all vulnerabilities.
Fix: update to 2.4.7.55 or later.

Package	Affected versions	Patched versions
plcwinnt codesys	`< 2.4.7.55`	`2.4.7.55`
runtime toolkit codesys	`< 2.4.7.55`	`2.4.7.55`

CODESYS V2 runtime system SP before 2.4.7.55 has a Heap-based Buffer Overflow.

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Package

Affected versions

Patched versions

< 2.4.7.55

2.4.7.55

< 2.4.7.55

2.4.7.55

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