CVE-2024-8937
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 · uneditedCWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability exists that could cause a potential arbitrary code execution after a successful Man-In-The Middle attack followed by sending a crafted Modbus function call to tamper with memory area involved in the authentication process.
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 · moderate confidenceA CWE-119 buffer overflow vulnerability in a Modbus-enabled device allows an attacker who has achieved MITM positioning to send crafted Modbus function calls that tamper with memory areas controlling the authentication process, potentially enabling arbitrary code execution.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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
- High
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
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 Modbus-enabled devices on the networkScan network assets for open Modbus ports (502/TCP and 502/UDP). Use network scanning tools or review device configurations to list all devices with Modbus protocol enabled or listening.Affected if Any device has Modbus ports open or Modbus communication is enabled in the environment
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Verify network segmentation for Modbus trafficReview network architecture diagrams and switch/router configurations to determine if Modbus traffic traverses untrusted network segments. Check if Modbus devices are isolated on dedicated VLANs or if they are accessible from shared networks.Affected if Modbus traffic can be intercepted from a position between the source and destination (MITM feasible)
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Inspect for unauthenticated or plaintext Modbus trafficCapture and analyze Modbus traffic using packet capture tools (e.g., Wireshark, tcpdump) on network segments where Modbus devices communicate. Look for unencrypted Modbus/TCP traffic without additional security wrappers.Affected if Modbus traffic is transmitted in plaintext without TLS or other encryption and is accessible to an attacker on the network path
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Check for authentication mechanisms on Modbus interfacesReview Modbus device documentation and configuration settings to determine if custom authentication (beyond function code restrictions) is implemented. Inspect whether memory areas controlling authentication can be accessed via Modbus function codes.Affected if Device lacks additional authentication layers beyond standard Modbus protocol and allows access to authentication-related memory via Modbus function codes
The environment is affected if Modbus is enabled on any device AND that device's Modbus traffic is accessible to an attacker positioned for MITM, particularly if no extra authentication protects the memory areas handling authentication.
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.
From vendor dataApply vendor-supplied firmware patches when available. Until patched, mitigate by implementing network segmentation to prevent MITM attacks and monitoring for suspicious Modbus traffic.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-8937 — 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-2024-8937 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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- Version or environment caveats, and links to real fixes
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