CVE-2026-50032Network attack vector

Server crash via empty MMS data list

Published Jul 23, 2026 · Updated Jul 23, 2026

NULL pointer dereference in libIEC61850 1.0.0 through 1.6.1 allows remote attackers to crash MMS servers via a crafted WriteRequest. The MMS Write Named Variable List handler processes an empty listOfData without verifying that a data element exists, leading to a NULL dereference. Reachability requires network access to the MMS service; no authentication or user interaction is required, and the documented consequence is server process termination.

CVSS severity8.7
High
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in libIEC61850 1.0.0 through 1.6.1 allows remote attackers to crash MMS servers via a crafted WriteRequest. The MMS Write Named Variable List handler processes an empty listOfData without verifying that a data element exists, leading to a NULL dereference. Reachability requires network access to the MMS service; no authentication or user interaction is required, and the documented consequence is server process termination.

The record

CVE
CVE-2026-50032
Published
Jul 23, 2026
Updated
Jul 23, 2026
Vendor
MZ Automation GmbH
Product
libIEC61850
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0 <=1.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MZ Automation GmbH · libIEC61850version=1.0.0 <=1.6.1

Published CVSS scores

7.5ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7ICS-CERTCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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