Is CVE-2023-27857 actively exploited?

No active exploitation of CVE-2023-27857 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-27857 be exploited remotely?

Yes. CVE-2023-27857 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-27857?

CVE-2023-27857 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2023-27857

HIGH

CVE-2023-27857

CWE-125Published: March 22, 2023· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2023-27857 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.