Control
CVE-2021-33485
CRITICAL
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
1DescriptionCVE.org
CODESYS Control Runtime system before 3.5.17.10 has a Heap-based Buffer Overflow.
AnalysisAI
CODESYS Control Runtime system before 3.5.17.10 has a Heap-based Buffer Overflow. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
Technical ContextAI
This vulnerability is classified as Out-of-bounds Write (CWE-787), which allows attackers to write data beyond allocated buffer boundaries leading to code execution or crashes. CODESYS Control Runtime system before 3.5.17.10 has a Heap-based Buffer Overflow. Affected products include: Codesys Control, Codesys Control Rte, Codesys Control Runtime System Toolkit, Codesys Control Win Sl, Codesys Embedded Target Visu Toolkit. Version information: before 3.5.17.10.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Validate write boundaries, use memory-safe languages, enable compiler protections (ASLR, stack canaries).
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In ConnectWise Control through 22.9.10032 (formerly known as ScreenConnect), after an executable file is signed, additio
In CODESYS V3 web server before 3.5.17.10, files or directories are accessible to External Parties. Rated high severity
Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Memory Corruption
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External POC / Exploit Code
Leaving vuln.today