CVE-2021-21867 Deserialization in CODESYS
An attacker can execute arbitrary commands by tricking a user into opening a specially crafted file in the CODESYS Development System.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-21867?
CVE-2021-21867 is a high-severity unsafe deserialization vulnerability in CODESYS, published on 18 Aug 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
An unsafe deserialization vulnerability exists in the ObjectManager.plugin ObjectStream.ProfileByteArray functionality of CODESYS GmbH CODESYS Development System 3.5.16 and 3.5.17. A specially crafted file can lead to arbitrary command execution. An attacker can provide a malicious file to trigger this vulnerability.
Weakness: CWE-502
Which versions are affected by CVE-2021-21867?
It affects 1 product.
Products include Codesys Codesys.
How do I fix CVE-2021-21867?
No fix has been published for CVE-2021-21867 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2021-21867 being exploited?
There is no known exploitation of CVE-2021-21867 in the wild and no public exploit code.
Other vulnerabilities in CODESYS
Sources
Also known as GHSA-847p-f9h7-f5x2.