CVE-2026-24933Network attack vector

Sensitive data exposure via unchecked TLS certificates

Published Feb 3, 2026 · Updated Feb 3, 2026

Improper certificate validation in ASUSTOR Data Master allows remote attackers to intercept API traffic through a man-in-the-middle attack. The API communication component sends HTTPS requests without validating the server's SSL/TLS certificate, allowing an intercepting endpoint to receive cleartext data. A network position permitting interception is required in versions 4.1.0 through 4.3.3.ROF1 and 5.0.0 through 5.1.1.RCI1; exposed data includes account emails, MD5 password hashes, and device serial numbers.

CVSS severity8.9
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in ASUSTOR Data Master allows remote attackers to intercept API traffic through a man-in-the-middle attack. The API communication component sends HTTPS requests without validating the server's SSL/TLS certificate, allowing an intercepting endpoint to receive cleartext data. A network position permitting interception is required in versions 4.1.0 through 4.3.3.ROF1 and 5.0.0 through 5.1.1.RCI1; exposed data includes account emails, MD5 password hashes, and device serial numbers.

The record

CVE
CVE-2026-24933
Published
Feb 3, 2026
Updated
Feb 3, 2026
Vendor
ASUSTOR Inc.
Product
ASUSTOR Data Master
Classifications
CWE-295, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 3, 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=4.1.0 <=4.3.3.ROF1
  2. Affected versionversion=5.0.0 <=5.1.1.RCI1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ASUSTOR Inc. · ASUSTOR Data Masterversion=4.1.0 <=4.3.3.ROF1; version=5.0.0 <=5.1.1.RCI1

Published CVSS scores

5.9NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
8.9ASUSTOR Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/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.

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-295Improper Certificate Validation
T1557Adversary-in-the-Middle

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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