CVE-2024-21870Network attack vector

Arbitrary file overwrite via unchecked tag paths

Published Apr 3, 2024 · Updated Nov 4, 2025

File write in OAS Engine Tags Configuration in Open Automation Software OAS Platform 19.00.0057 allows remote authenticated users to overwrite files. The engine accepts attacker-controlled File Data Source Path and File Name values from an authenticated CSV_Import request, then uses them when a file-backed Tag writes Binary, Text, or XML data. High application privileges and a sequence of configuration requests are required, and writes are limited by the filesystem permissions of the OAS Engine service account.

CVSS severity4.9
Medium
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

File write in OAS Engine Tags Configuration in Open Automation Software OAS Platform 19.00.0057 allows remote authenticated users to overwrite files. The engine accepts attacker-controlled File Data Source Path and File Name values from an authenticated CSV_Import request, then uses them when a file-backed Tag writes Binary, Text, or XML data. High application privileges and a sequence of configuration requests are required, and writes are limited by the filesystem permissions of the OAS Engine service account.

The record

CVE
CVE-2024-21870
Published
Apr 3, 2024
Updated
Nov 4, 2025
Vendor
Open Automation Software
Product
OAS Platform
Classifications
CWE-73, T0866
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record 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=V19.00.0057

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open Automation Software · OAS Platformversion=V19.00.0057

Published CVSS scores

4.9Cisco TalosCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-73External Control of File Name or Path
T0866Exploitation of Remote Services

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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