CVE-2023-40235Public exploitNetwork attack vector

NTLM hash disclosure via XML namespace resolution

Published Aug 10, 2023 · Updated Oct 9, 2024

Improper resource resolution in Archi before 5.1.0 allows remote attackers to disclose a user’s NTLM hash through a crafted project file. The EMF resource factory treats an unregistered XML namespace URI as a location, causing a crafted UNC namespace to trigger SMB authentication. Exploitation requires a user to open the file and a share that rejects guest access; the captured hash supports offline password cracking.

CVSS severity6.5
Medium
EPSS probability0.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper resource resolution in Archi before 5.1.0 allows remote attackers to disclose a user’s NTLM hash through a crafted project file. The EMF resource factory treats an unregistered XML namespace URI as a location, causing a crafted UNC namespace to trigger SMB authentication. Exploitation requires a user to open the file and a share that rejects guest access; the captured hash supports offline password cracking.

The record

CVE
CVE-2023-40235
Published
Aug 10, 2023
Updated
Oct 9, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1187
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/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.

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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 exploitPublished

Weakness, pattern, technique

T1187Forced Authentication

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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