CVE-2023-27857
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedIn 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceA heap-based buffer over-read vulnerability exists in Rockwell Automation's ThinManager ThinServer. The vulnerability occurs when the message length field indicates more data than actually exists in the message buffer, causing the application to read past the allocated buffer boundary. An unauthenticated remote attacker can exploit this to crash ThinServer.exe via a read access violation.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data>= 11.0.0, < 11.0.5>= 11.1.0, < 11.1.5>= 11.2.0, < 11.2.6>= 12.0.0, < 12.0.3>= 12.1.0, < 12.1.4= 13.0.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify installed ThinManager versionLocate the ThinManager installation directory or check the program's version information. Common locations include C:\Program Files\Rockwell Automation\ThinManager or C:\Program Files (x86)\Rockwell Automation\ThinManager. Right-click on ThinManager.exe, ThinServer.exe, or the main application executable, select Properties, and view the Details tab for the File Version.Affected if The installed version falls within any of these ranges: >= 11.0.0 and < 11.0.5; >= 11.1.0 and < 11.1.5; >= 11.2.0 and < 11.2.6; >= 12.0.0 and < 12.0.3; >= 12.1.0 and < 12.1.4; or equals exactly 13.0.0
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Confirm ThinServer.exe process is runningOpen Task Manager or use command 'tasklist /FI "IMAGENAME eq ThinServer.exe"' to check if ThinServer.exe is currently running on the system.Affected if ThinServer.exe is running and the version is within the affected ranges from step 1
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Assess network exposure of ThinServer serviceDetermine if ThinServer.exe is listening on network ports and accessible from untrusted networks. Use 'netstat -an' to identify listening ports, then verify whether firewall rules or network segmentation restrict access to those ports from external systems.Affected if ThinServer.exe is running with exposed network listeners and the version is vulnerable according to step 1
You are affected if ThinServer.exe is running with a version matching any of the vulnerable ranges and the service is network-accessible to unauthenticated attackers.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped11.0.511.1.511.2.6
Apply available vendor patches for ThinManager ThinServer. Until patched, restrict network access to ThinServer through firewalls or network segmentation to limit exposure to unauthenticated attackers.
Upgrade to ThinManager 12.0.3 (or 11.0.5/11.1.5/11.2.6 depending on your current version branch)
- Identify the currently installed ThinManager version by checking ThinManager ThinServer
- Determine which version branch you are running (11.0.x, 11.1.x, 11.2.x, or 12.0.x)
- Download the appropriate fixed version from the Rockwell Automation website or support portal
- Stop the ThinManager ThinServer service before upgrading
- Install the fixed version (11.0.5, 11.1.5, 11.2.6, or 12.0.3 or later depending on your version branch)
- Restart the ThinManager ThinServer service
- Verify the service starts successfully and monitor for stability
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation4.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-27857 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2023-27857 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data