CVE-2023-27856Public exploitNetwork attack vector

Arbitrary file download via message filename traversal

Published Mar 21, 2023 · Updated Feb 25, 2025

Path traversal in Rockwell Automation ThinManager ThinServer 6.x through 13.0.1 allows remote attackers to download arbitrary files. The message type 8 handler accepts a null-terminated file_name field without restricting traversal sequences to an intended directory. An unauthenticated connection to the ThinServer service on TCP port 2031 is enough to read files accessible to ThinServer on its installation drive.

CVSS severity7.5
High
EPSS probability77.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Rockwell Automation ThinManager ThinServer 6.x through 13.0.1 allows remote attackers to download arbitrary files. The message type 8 handler accepts a null-terminated file_name field without restricting traversal sequences to an intended directory. An unauthenticated connection to the ThinServer service on TCP port 2031 is enough to read files accessible to ThinServer on its installation drive.

The record

CVE
CVE-2023-27856
Published
Mar 21, 2023
Updated
Feb 25, 2025
Vendor
Rockwell Automation
Product
ThinManager
Classifications
CWE-22, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 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=11.0.0 - 11.0.5
  2. Affected versionversion=11.1.0 - 11.1.5
  3. Affected versionversion=11.2.0 - 11.2.6
  4. Affected versionversion=12.0.0 - 12.0.4
  5. Affected versionversion=12.1.0 - 12.1.5
  6. Affected versionversion=13.0.0 - 13.0.1
  7. Affected versionversion=6.x - 10.x

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rockwell Automation · ThinManagerversion=11.0.0 - 11.0.5; version=11.1.0 - 11.1.5; version=11.2.0 - 11.2.6; version=12.0.0 - 12.0.4; version=12.1.0 - 12.1.5; version=13.0.0 - 13.0.1; version=6.x - 10.x

Published CVSS scores

7.5Rockwell AutomationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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.

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 exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

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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