CVE-2024-6876

PLC disclosure and crash via unchecked month value

Published Sep 10, 2024 · Updated Oct 1, 2024

Out-of-bounds read in OSCAT Basic Library before 3.3.5 allows local users to read limited PLC data or crash the PLC. The MONTH_TO_STRING function fails to fully validate a supplied month value before using it to select a string representation. Exploitation requires an external input path, such as a visualization field, that passes an out-of-range integer into the PLC program without independent range checking.

CVSS severity5.1
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in OSCAT Basic Library before 3.3.5 allows local users to read limited PLC data or crash the PLC. The MONTH_TO_STRING function fails to fully validate a supplied month value before using it to select a string representation. Exploitation requires an external input path, such as a visualization field, that passes an out-of-range integer into the PLC program without independent range checking.

The record

CVE
CVE-2024-6876
Published
Sep 10, 2024
Updated
Oct 1, 2024
Vendor
OSCAT
Product
OSCAT Basic Library
Classifications
CWE-125, T0814
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 10, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 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=0 <335
  2. Affected versionversion=0 <3.3.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

OSCAT · OSCAT Basic Libraryversion=0 <335; version=0 <3.3.5

Published CVSS scores

5.1CODESYS GmbHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T0814Denial 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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