CVE-2021-34596 Explained : Impact and Mitigation
Learn about CVE-2021-34596, a vulnerability in CODESYS V2 Runtime Toolkit and PLCWinNT versions before V2.4.7.56, allowing denial-of-service attacks. Find mitigation steps here.
A crafted request may cause a read access to an uninitialized pointer in CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56, resulting in a denial-of-service condition.
Understanding CVE-2021-34596
This CVE relates to an access of an uninitialized pointer leading to a denial-of-service vulnerability in CODESYS V2 products.
What is CVE-2021-34596?
CVE-2021-34596 is a vulnerability in CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT versions prior to V2.4.7.56. An attacker can exploit this issue via a crafted request, resulting in a denial-of-service condition.
The Impact of CVE-2021-34596
The vulnerability has a base score of 6.5, with a low attack complexity and network vector. It can cause a high availability impact but no confidentiality or integrity impact.
Technical Details of CVE-2021-34596
This section provides deeper insights into the vulnerability.
Vulnerability Description
The vulnerability allows attackers to trigger a denial-of-service condition by exploiting an uninitialized pointer access in CODESYS V2 products.
Affected Systems and Versions
The affected products include CODESYS V2 Runtime Toolkit 32 bit full and PLCWinNT versions earlier than V2.4.7.56.
Exploitation Mechanism
Exploitation occurs through a specifically crafted request that triggers read access to the uninitialized pointer, leading to the denial-of-service.
Mitigation and Prevention
To address CVE-2021-34596, follow the steps mentioned below.
Immediate Steps to Take
CODESYS GmbH has released updates to mitigate the vulnerability issue. Users should apply the following patches:
- CODESYS Runtime Toolkit 32 bit full version V2.4.7.56
- CODESYS PLCWinNT version V2.4.7.56, also included in CODESYS Development System setup version V2.3.9.68.
Long-Term Security Practices
Regularly update and patch CODESYS products to prevent such vulnerabilities. Implement secure coding practices and monitor for any abnormal system behavior.
Patching and Updates
Stay informed on CODESYS security advisories and promptly apply patches and updates to ensure system security.