CVE-2024-50956Public exploit

Crash or code execution via oversized Modbus copy

Published Nov 13, 2024 · Updated Nov 25, 2024

Buffer overflow in Inovance AM400 PLC firmware allows remote attackers to crash a device or execute code via a crafted Modbus message. RecvSocketData trusts the message length when protocol identifier 0xDD or 0xEE is present, so memcpy copies more than 0x2020 bytes into stack storage. Access to TCP port 502 on the PLC network is sufficient; the demonstrated request leaves the device unreachable, while code execution is unconfirmed.

CVSS severity6.5
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Inovance AM400 PLC firmware allows remote attackers to crash a device or execute code via a crafted Modbus message. RecvSocketData trusts the message length when protocol identifier 0xDD or 0xEE is present, so memcpy copies more than 0x2020 bytes into stack storage. Access to TCP port 502 on the PLC network is sufficient; the demonstrated request leaves the device unreachable, while code execution is unconfirmed.

The record

CVE
CVE-2024-50956
Published
Nov 13, 2024
Updated
Nov 25, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T0814
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 13, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 25, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:A/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T0814Denial of Service

Public exploit references

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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