What’s Vulnerable › Vulnerabilities

CVE-2022-31803: CODESYS Gateway Server V2 prone to Denial of Service Attack

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-06-24 · updated 2026-06-17
• Weakness: CWE-400

Description

In CODESYS Gateway Server V2 an insufficient check for the activity of TCP client connections allows an unauthenticated attacker to consume all available TCP connections and prevent legitimate users or clients from establishing a new connection to the CODESYS Gateway Server V2. Existing connections are not affected and therefore remain intact.

Affected products

• CODESYS Gateway Server V2: from 2.0 before 2.3.9.38 — fixed in 2.3.9.38

How to fix

Upgrade to a fixed version: CODESYS Gateway Server V2 2.3.9.38. Check the vendor advisory for mitigations.

References

• https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=17141&token=17867e35cfd30c77ba0137f9a17b3a557a4b7b66&download=
• https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=17141&token=17867e35cfd30c77ba0137f9a17b3a557a4b7b66&download=

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