CVE-2023-27857: Rockwell Automation ThinManager ThinServer Heap-Based Buffer Overflow

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 18.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-03-22 · updated 2026-06-17
Weakness: CWE-125

Description

In affected versions, a heap-based buffer over-read condition occurs when the message field indicates more data than is present in the message field in Rockwell Automation's ThinManager ThinServer. An unauthenticated remote attacker can exploit this vulnerability to crash ThinServer.exe due to a read access violation.

Affected products

Rockwell Automation ThinManager ThinServer: from 11.0.0 before 11.0.5; from 11.1.0 before 11.1.5; from 11.2.0 before 11.2.6; from 12.0.0 before 12.0.3; from 12.1.0 before 12.1.4; 13.0.0 — fixed in 11.0.5, 11.1.5, 11.2.6, 12.0.3, 12.1.4

How to fix

Upgrade to a fixed version: Rockwell Automation ThinManager ThinServer 11.0.5, 11.1.5, 11.2.6, 12.0.3. Check the vendor advisory for mitigations.

References

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