CVE-2021-34595 — CODESYS V2 runtime: out-of-bounds read or write access may result in denial-of-service

2026-10-07T10:07:24.312400+00:00

Affected: CODESYS V2

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.

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CVE-2021-34595 — CODESYS V2 runtime: out-of-bounds read or write access may result in denial-of-service