CVE-2020-7052Public exploitNetwork attack vector

Service interruption via oversized channel-buffer allocation

Published Jan 24, 2020 · Updated Aug 4, 2024

Uncontrolled memory allocation in communication servers in CODESYS V3 products before 3.5.15.30 allows remote attackers to interrupt services. The channel server accepts extreme MaxChannels and BufferSize values whose signed multiplication drives an oversized SysMemAllocData heap request. The published PoC obtains an anonymous Gateway session before changing those settings; exhaustion leaves layer 7 services unavailable after restart.

CVSS severity7.1
High
EPSS probability1.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled memory allocation in communication servers in CODESYS V3 products before 3.5.15.30 allows remote attackers to interrupt services. The channel server accepts extreme MaxChannels and BufferSize values whose signed multiplication drives an oversized SysMemAllocData heap request. The published PoC obtains an anonymous Gateway session before changing those settings; exhaustion leaves layer 7 services unavailable after restart.

The record

CVE
CVE-2020-7052
Published
Jan 24, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-770, CAPEC-130, T1499.004
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Jan 24, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.13S-Smart Software Solutions GmbHCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8TenableAV:N/AC:L/Au:N/C:N/I:N/A:C
4.0NIST NVDAV:N/AC:L/Au:S/C:N/I:N/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.

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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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CAPEC-130Excessive Allocation
T1499.004Application or System Exploitation

Public exploit references

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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