CVE-2023-51838Network attack vector

Information disclosure via HMAC-MD5 authentication

Published Feb 2, 2024 · Updated Jun 16, 2025

Broken cryptography in Ylianst MeshCentral 1.1.16 allows remote attackers to disclose information through RDP protocol traffic. The RDP security and Network Level Authentication code computes message authentication values with HMAC-MD5, permitting brute-force analysis. The published report does not identify the protected data, required traffic position, or a demonstrated recovery procedure.

CVSS severity7.5
High
EPSS probability0.53%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Broken cryptography in Ylianst MeshCentral 1.1.16 allows remote attackers to disclose information through RDP protocol traffic. The RDP security and Network Level Authentication code computes message authentication values with HMAC-MD5, permitting brute-force analysis. The published report does not identify the protected data, required traffic position, or a demonstrated recovery procedure.

The record

CVE
CVE-2023-51838
Published
Feb 2, 2024
Updated
Jun 16, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-327
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 2, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 16, 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?

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

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm

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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