CVE-2021-34583 : Security Advisory and Response
Learn about the CVE-2021-34583 vulnerability in CODESYS V2 web server triggering a heap-based buffer overflow. Find mitigation steps and update solutions to enhance security.
A crafted web server requests vulnerability in the CODESYS V2 web server could lead to a denial-of-service condition. Learn about the impact, technical details, and mitigation steps.
Understanding CVE-2021-34583
This CVE involves a heap-based buffer overflow in the CODESYS V2 web server due to crafted web server requests, potentially causing a crash.
What is CVE-2021-34583?
Crafted web server requests may cause a heap-based buffer overflow, leading to a denial-of-service condition in the CODESYS V2 web server prior to version V1.1.9.22.
The Impact of CVE-2021-34583
With a CVSS v3.1 base score of 7.5 (High), this vulnerability could allow attackers to trigger a denial-of-service condition on affected systems.
Technical Details of CVE-2021-34583
The vulnerability is classified as a CWE-122 Heap-based Buffer Overflow, affecting all CODESYS V2 web servers prior to version V1.1.9.22.
Vulnerability Description
Crafted web server requests may trigger a heap-based buffer overflow, potentially leading to a crash in the CODESYS V2 web server.
Affected Systems and Versions
All web servers running CODESYS V2 versions earlier than V1.1.9.22 are impacted by this vulnerability.
Exploitation Mechanism
Attackers can exploit this vulnerability by sending specially crafted web server requests, causing a heap-based buffer overflow.
Mitigation and Prevention
To address CVE-2021-34583, immediate steps should be taken to apply the recommended solutions and ensure long-term security practices.
Immediate Steps to Take
Update the CODESYS V2 web server to version V1.1.9.22 or later to mitigate the vulnerability and prevent exploitation.
Long-Term Security Practices
Regularly monitor for security updates and patches from CODESYS GmbH to enhance the overall security posture.
Patching and Updates
CODESYS GmbH has released version V1.1.9.22 of the CODESYS V2 web server to address the vulnerability issues. Ensure that the CODESYS Development System setup is also updated to version V2.3.9.68.