CVE-2021-34584: CODESYS V2 web server: crafted requests could trigger a buffer over-read (DoS)
First published: Tue Oct 26 2021(Updated: )
Crafted web server requests can be utilised to read partial stack or heap memory or may trigger a denial-of- service condition due to a crash in the CODESYS V2 web server prior to V1.1.9.22.
Credit: info@cert.vde.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Codesys | <1.1.9.22 |
Remedy
CODESYS GmbH has released version V1.1.9.22 of the CODESYS V2 web server to solve the noted vulnerability issues. This version of the CODESYS V2 web server is also part of the CODESYS Development System setup version V2.3.9.68.
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-34584?
CVE-2021-34584 is rated as a high severity vulnerability because it can lead to exposure of sensitive memory data or denial-of-service conditions.
How do I fix CVE-2021-34584?
To fix CVE-2021-34584, upgrade the CODESYS V2 web server to version 1.1.9.22 or later.
What types of attacks can exploit CVE-2021-34584?
CVE-2021-34584 can be exploited through crafted web server requests to read sensitive memory or cause crashes.
What is affected by CVE-2021-34584?
CVE-2021-34584 affects CODESYS versions prior to 1.1.9.22.
Are there workarounds for CVE-2021-34584?
There are no known effective workarounds for CVE-2021-34584 beyond upgrading to a patched version.
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