What is CVE-2021-34599?

CVE-2021-34599 is a vulnerability in CODESYS Git that allows attackers to bypass certificate validation in HTTPS handshakes.

What is the severity of CVE-2021-34599?

The severity of CVE-2021-34599 is high with a CVSS score of 7.4.

Which versions of CODESYS Git are affected by CVE-2021-34599?

Versions prior to V1.1.0.0 of CODESYS Git are affected by CVE-2021-34599.

How can I fix CVE-2021-34599?

Upgrade to CODESYS Git version V1.1.0.0 or later to fix CVE-2021-34599.

Vulnerability/
CVE-2021-34599

high

7.4

CWE

295

1/12/2021

17/9/2024

CVE-2021-34599: Improper Certificate Validation in CODESYS Git

Q: Does CODESYS Git verify HTTPS certificates by default?

No, CODESYS Git does not implement certificate validation by default.

First published: Wed Dec 01 2021(Updated: )

Affected versions of CODESYS Git in Versions prior to V1.1.0.0 lack certificate validation in HTTPS handshakes. CODESYS Git does not implement certificate validation by default, so it does not verify that the server provides a valid and trusted HTTPS certificate. Since the certificate of the server to which the connection is made is not properly verified, the server connection is vulnerable to a man-in-the-middle attack.

Credit: info@cert.vde.com

Affected Software	Affected Version	How to fix
CODESYS Git	<1.1.0.0
CODESYS Development System	<3.5.17.0

Remedy

CODESYS GmbH has released CODESYS Git V1.1.0.0 to solve this vulnerability issue. CODESYS Git V1.1.0.0 can be downloaded and installed directly with the CODESYS Installer. CODESYS Git requires a CODESYS Development System version of V3.5.17.0 or newer.

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Reference Links

https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16959&token=3ce11e44a3277c4520d732ea2e630f2e06bd46ff&download

Frequently Asked Questions

What is CVE-2021-34599?
CVE-2021-34599 is a vulnerability in CODESYS Git that allows attackers to bypass certificate validation in HTTPS handshakes.
What is the severity of CVE-2021-34599?
The severity of CVE-2021-34599 is high with a CVSS score of 7.4.
Which versions of CODESYS Git are affected by CVE-2021-34599?
Versions prior to V1.1.0.0 of CODESYS Git are affected by CVE-2021-34599.
Does CODESYS Git verify HTTPS certificates by default?
No, CODESYS Git does not implement certificate validation by default.
How can I fix CVE-2021-34599?
Upgrade to CODESYS Git version V1.1.0.0 or later to fix CVE-2021-34599.

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