CVE-2022-3976

File access via unvalidated MMS filenames

Published Nov 13, 2022 · Updated Apr 15, 2025

Path traversal in libIEC61850 1.0 through 1.4 allows remote authenticated users to access files via crafted MMS filenames. MMS client and server file-service handlers pass unvalidated filenames containing traversal components to open, delete, obtain, directory, and rename operations. Adjacent-network access and low privileges are required; successful requests can read, write, rename, or delete files outside the intended filestore.

CVSS severity8.8
High
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in libIEC61850 1.0 through 1.4 allows remote authenticated users to access files via crafted MMS filenames. MMS client and server file-service handlers pass unvalidated filenames containing traversal components to open, delete, obtain, directory, and rename operations. Adjacent-network access and low privileges are required; successful requests can read, write, rename, or delete files outside the intended filestore.

The record

CVE
CVE-2022-3976
Published
Nov 13, 2022
Updated
Apr 15, 2025
Vendor
MZ Automation GmbH
Product
libIEC61850
Classifications
CWE-22, T1005
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 13, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 2025Record 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
  2. Affected versionversion=1.1
  3. Affected versionversion=1.2
  4. Affected versionversion=1.3
  5. Affected versionversion=1.4

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

MZ Automation GmbH · libIEC61850version=1.0; version=1.1; version=1.2; version=1.3; version=1.4

Published CVSS scores

5.5VulDB CNACVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
8.8NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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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