CVE-2021-34586

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

In the CODESYS V2 web server prior to V1.1.9.22 crafted web server requests may cause a Null pointer dereference in the CODESYS web server and may result in a denial-of-service condition.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-476

Affected software

Vendor	Product	Versions
CODESYS	CODESYS V2	>= all web servers, < V1.1.9.22

References

https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16876&token=a3f1d937f95e7034879f4f2ea8e5a99b168256a7&download=Vendor Advisory
https://www.tenable.com/security/research/tra-2021-47Exploit, Third Party Advisory
https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16876&token=a3f1d937f95e7034879f4f2ea8e5a99b168256a7&download=Vendor Advisory
https://www.tenable.com/security/research/tra-2021-47Exploit, Third Party Advisory

Timeline

Published: Oct 26, 2021
Last modified: Jun 17, 2026
NVD status: Analyzed

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