CVE-2022-31804Network attack vector

Service crash via unchecked request-sized memory allocation

Published Jun 24, 2022 · Updated Sep 16, 2024

Memory-allocation denial of service in CODESYS Gateway Server V2 before 2.3.9.38 allows remote attackers to crash the gateway. The server trusts a size value in a crafted request when allocating memory and does not enforce the expected limit, permitting an arbitrary-size allocation. No authentication or user interaction is required; exhausting available memory terminates the gateway and interrupts routed communications.

CVSS severity7.5
High
EPSS probability1.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory-allocation denial of service in CODESYS Gateway Server V2 before 2.3.9.38 allows remote attackers to crash the gateway. The server trusts a size value in a crafted request when allocating memory and does not enforce the expected limit, permitting an arbitrary-size allocation. No authentication or user interaction is required; exhausting available memory terminates the gateway and interrupts routed communications.

The record

CVE
CVE-2022-31804
Published
Jun 24, 2022
Updated
Sep 16, 2024
Vendor
CODESYS GmbH
Product
CODESYS Gateway Server V2
Classifications
CWE-789, 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=unspecified <V2.3.9.38

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

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

Published CVSS scores

5.0NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5CERT@VDECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-789Memory Allocation with Excessive Size Value
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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