CVE-2026-18187Network attack vector

Memory disclosure and crash via format-string injection

Published Jul 30, 2026 · Updated Jul 30, 2026

Format string injection in ASUSTOR ADM 4.1.0 through 4.3.3.RUN1 and 5.0.0 through 5.1.3.RI81 allows remote authenticated users to disclose memory. Internal Backup places user-controlled task input in an error response and passes it to an unsafe format string operation. Remote authenticated users can read process memory or crash only the affected CGI process.

CVSS severity7.1
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Format string injection in ASUSTOR ADM 4.1.0 through 4.3.3.RUN1 and 5.0.0 through 5.1.3.RI81 allows remote authenticated users to disclose memory. Internal Backup places user-controlled task input in an error response and passes it to an unsafe format string operation. Remote authenticated users can read process memory or crash only the affected CGI process.

The record

CVE
CVE-2026-18187
Published
Jul 30, 2026
Updated
Jul 30, 2026
Vendor
ASUSTOR Inc.
Product
ASUSTOR Data Master
Classifications
CWE-134
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 30, 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.RUN1
  2. Affected versionversion=5.0.0 <=5.1.3.RI81

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ASUSTOR Inc. · ASUSTOR Data Masterversion=4.1.0 <=4.3.3.RUN1; version=5.0.0 <=5.1.3.RI81

Published CVSS scores

7.1ASUSTOR Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-134Use of Externally-Controlled Format String

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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