CVE-2022-32137Network attack vector

Authenticated memory overwrite via crafted service request

Published Jun 24, 2022 · Updated Sep 16, 2024

Heap-based buffer overflow in CODESYS Runtime Toolkit and PLCWinNT before 2.4.7.57 allows remote authenticated users to overwrite memory. The communication server writes beyond a heap allocation while processing a crafted CODESYS protocol service request; the affected parser and field are undisclosed. A prior controller login is required unless no level 1 online password is configured, and exploitation can also interrupt the runtime service.

CVSS severity8.8
High
EPSS probability1.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in CODESYS Runtime Toolkit and PLCWinNT before 2.4.7.57 allows remote authenticated users to overwrite memory. The communication server writes beyond a heap allocation while processing a crafted CODESYS protocol service request; the affected parser and field are undisclosed. A prior controller login is required unless no level 1 online password is configured, and exploitation can also interrupt the runtime service.

The record

CVE
CVE-2022-32137
Published
Jun 24, 2022
Updated
Sep 16, 2024
Vendor
CODESYS GmbH
Product
CODESYS Runtime Toolkit
Classifications
CWE-122, T1499
Attack vector
network
Privileges
authenticated

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 <V2.4.7.57

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

CODESYS GmbH · CODESYS Runtime Toolkitversion=V2 <V2.4.7.57
CODESYS GmbH · CODESYS Runtime PLCWinNTversion=V2 <V2.4.7.57

Published CVSS scores

8.8CODESYS GmbHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1499Endpoint Denial of Service

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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