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CVE-2021-30193

CODESYS V2 Web-Server before 1.1.9.20 has an Out-of-bounds Write.

Published: May 25, 2021Updated: Aug 15, 2025 Sources: CVE List NVD BDU csafCWE-787
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
1.2%
Top 37.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

This CSAF advisory was extracted from unstructured data and may contain inaccuracies. If you notice any errors, please reach out to the designated contact at CISA CSAF: central@cisa.dhs.gov

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-787

Affected Products

CODESYSCODESYS GmbHICS / OT / IoT
750-893 firmwarewagoICS / OT / IoT
750-891 firmwarewagoICS / OT / IoT
750-890 firmwarewagoICS / OT / IoT
750-889 firmwarewagoICS / OT / IoT
codesys gmbhcommercialDEICS / OT / IoTaka codesys
wagocommercialDEICS / OT / IoT
and 25 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://xakep.ru/2021/06/04/codesys-flaws/
xakep.ru
https://nvd.nist.gov/vuln/detail/CVE-2021-30193
nvd.nist.gov
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2021/icsa-21-173-02.json
raw.githubusercontent.com
and 14 more references View all →

Timeline

Published
May 25, 2021
Last Updated
Aug 15, 2025

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