CVE-2026-18187

A format string vulnerability was found in the Internal Backup on the ADM. The vulnerability occurs because user-controlled task input may be included in an error response and processed through an unsafe format string operation. An authenticated attacker can exploit this issue to disclose memory information or cause denial of service of the affected CGI process. Affected products and versions include: from ADM 4.1.0 through ADM 4.3.3.RUN1 as well as from ADM 5.0.0 through ADM 5.1.3.RI81.

CVSS v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://www.asustor.com/security/security_advisory_detail?id=67	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:asustor:data_master::::::::
	cpe:2.3:o:asustor:data_master::::::::

History

No history.

Information

Published : 2026-07-30 03:16

Updated : 2026-08-04 14:17

NVD link : CVE-2026-18187

Mitre link : CVE-2026-18187

CVE.ORG link : CVE-2026-18187

JSON object : View

Products Affected

asustor

data_master

CWE

CWE-134

Use of Externally-Controlled Format String

{"id": "CVE-2026-18187", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-18187", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-30T13:20:28.078436Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 2.8}], "cvssMetricV40": [{"type": "Secondary", "source": "security@asustor.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 7.1, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "security@asustor.com", "affectedData": [{"vendor": "ASUSTOR Inc.", "product": "ADM", "versions": [{"status": "affected", "version": "5.0.0", "versionType": "custom", "lessThanOrEqual": "5.1.3.RI81"}, {"status": "affected", "version": "4.1.0", "versionType": "custom", "lessThanOrEqual": "4.3.3.RUN1"}], "platforms": ["Linux", "x86", "ARM", "64 bit"], "packageName": "Internal Backup", "defaultStatus": "unaffected"}]}], "published": "2026-07-30T03:16:24.363", "references": [{"url": "https://www.asustor.com/security/security_advisory_detail?id=67", "tags": ["Vendor Advisory"], "source": "security@asustor.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security@asustor.com", "description": [{"lang": "en", "value": "CWE-134"}]}], "descriptions": [{"lang": "en", "value": "A format string vulnerability was found in the Internal Backup on the ADM. The vulnerability occurs because user-controlled task input may be included in an error response and processed through an unsafe format string operation. An authenticated attacker can exploit this issue to disclose memory information or cause denial of service of the affected CGI process.\nAffected products and versions include: from ADM 4.1.0 through ADM 4.3.3.RUN1 as well as from ADM 5.0.0 through ADM 5.1.3.RI81."}], "lastModified": "2026-08-04T14:17:56.053", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:asustor:data_master:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E8B93EE0-5A71-4537-A116-D3A024BFD988", "versionEndIncluding": "4.3.3.run1", "versionStartIncluding": "4.1.0.rhu2"}, {"criteria": "cpe:2.3:o:asustor:data_master:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1F80E3A8-B1E6-4AD0-95B4-20B47991E8EF", "versionEndExcluding": "5.1.4.rjv2", "versionStartIncluding": "5.0.0.ra82"}], "operator": "OR"}]}], "sourceIdentifier": "security@asustor.com"}