CVE-2022-31803Network attack vector

Remote service interruption via exhausted TCP connections

Published Jun 24, 2022 · Updated Sep 16, 2024

Resource exhaustion in CODESYS Gateway Server V2 before 2.3.9.38 allows remote attackers to block new TCP client connections. The server insufficiently checks whether TCP client connections remain active, allowing crafted requests to consume every available connection slot. Unauthenticated remote access is sufficient; new clients are denied service while established connections remain intact.

CVSS severity5.3
Medium
EPSS probability1.14%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in CODESYS Gateway Server V2 before 2.3.9.38 allows remote attackers to block new TCP client connections. The server insufficiently checks whether TCP client connections remain active, allowing crafted requests to consume every available connection slot. Unauthenticated remote access is sufficient; new clients are denied service while established connections remain intact.

The record

CVE
CVE-2022-31803
Published
Jun 24, 2022
Updated
Sep 16, 2024
Vendor
CODESYS GmbH
Product
CODESYS Gateway Server V2
Classifications
CWE-400, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=V2 <V2.3.9.38

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CODESYS GmbH · CODESYS Gateway Server V2version=V2 <V2.3.9.38

Published CVSS scores

5.0NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
5.3CERT@VDECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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