CVE-2023-29446

NTLMv2 hash capture via UNC path injection

Published Jan 10, 2024 · Updated Nov 14, 2024

Improper input validation in PTC Kepware Server 6.14.263.0 and earlier allows attackers to capture Windows user NTLMv2 hashes. The project-file workflow accepts an injected UNC path and initiates Windows authentication to the referenced network location. Exploitation requires a user to load the malicious project and click a specific GUI button, after which the captured hash can be cracked offline.

CVSS severity4.7
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in PTC Kepware Server 6.14.263.0 and earlier allows attackers to capture Windows user NTLMv2 hashes. The project-file workflow accepts an injected UNC path and initiates Windows authentication to the referenced network location. Exploitation requires a user to load the malicious project and click a specific GUI button, after which the captured hash can be cracked offline.

The record

CVE
CVE-2023-29446
Published
Jan 10, 2024
Updated
Nov 14, 2024
Vendor
Kepware
Product
Kepware Server
Classifications
CWE-20, CAPEC-644, T1187
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 10, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 14, 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?

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

  1. Affected versionversion=0 <=6.14.263.0
  2. Affected versionversion=8.0 <=8.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Kepware · Kepware Serverversion=0 <=6.14.263.0; version=8.0 <=8.5

Published CVSS scores

4.7CISACVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
4.7Dragos CNACVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
4.7NVDCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:N/A: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.

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

No observations available

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

Weakness, pattern, technique

CWE-20Improper Input Validation
CAPEC-644Use of Captured Hashes (Pass The Hash)
T1187Forced Authentication

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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