CVE-2021-33485
CODESYS Control Runtime system before 3.5.17.10 has a Heap-based Buffer Overflow.
CODESYS Control Runtime system before 3.5.17.10 has a Heap-based Buffer Overflow.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
CODESYS Control Runtime system before 3.5.17.10 has a Heap-based Buffer Overflow.
- Record
CVE-2021-33485- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-787, CWE-122
- Updated
- 2026-11-02
CVE List
CODESYS Control Runtime system before 3.5.17.10 has a Heap-based Buffer Overflow.
- Record
CVE-2021-33485- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
EUVDEUVD-2021-20188
CODESYS Control Runtime system before 3.5.17.10 has a Heap-based Buffer Overflow.
- Record
EUVD-2021-20188- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-mrr3-f59g-2946
CODESYS Control Runtime system before 3.5.17.10 has a Heap-based Buffer Overflow.
CODESYS Control Runtime system before 3.5.17.10 has a Heap-based Buffer Overflow.
- Record
GHSA-mrr3-f59g-2946- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-122, CWE-787
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-33485 is a critical vulnerability (CVSS 9.8) in Codesys Control, published August 3, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.36%, the 71st percentile. No source names a fixed version.