CVE-2023-27857Network attack vector

Service crash via oversized message length field

Published Mar 22, 2023 · Updated Oct 21, 2024

Out-of-bounds read in Rockwell Automation ThinManager ThinServer allows remote attackers to crash ThinServer.exe via a crafted message. The msg_7_35.flen field trusts a declared length larger than the available fdata buffer, causing a heap over-read and read access violation. TCP port 2031 accepts the message without authentication; exploitation interrupts the ThinServer service and does not directly alter data.

CVSS severity7.5
High
EPSS probability18.34%
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 Rockwell Automation ThinManager ThinServer allows remote attackers to crash ThinServer.exe via a crafted message. The msg_7_35.flen field trusts a declared length larger than the available fdata buffer, causing a heap over-read and read access violation. TCP port 2031 accepts the message without authentication; exploitation interrupts the ThinServer service and does not directly alter data.

The record

CVE
CVE-2023-27857
Published
Mar 22, 2023
Updated
Oct 21, 2024
Vendor
Rockwell Automation
Product
ThinManager
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 22, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 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=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:N/I:N/A:H

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation

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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