What is the CVSS score of CVE-2025-8611?

CVE-2025-8611 has a CVSS 3.0 base score of 9.8 (Critical). CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 2.2%.

Which versions of Cyber Backup are affected by CVE-2025-8611?

CVE-2025-8611 presents critical security risk, a missing authentication vulnerability rated CVSS 9.8.

How to fix or mitigate CVE-2025-8611?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Audit authentication configurations and rotate any potentially compromised credentials.

Cyber Backup CVE-2025-8611

CRITICAL

Missing Authentication for Critical Function (CWE-306)

2025-08-20 zdi-disclosures@trendmicro.com

Authentication Bypass RCE Cyber Backup

9.8

CVSS 3.0 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:07 vuln.today

CVE Published

Aug 20, 2025 - 17:15 nvd

CRITICAL 9.8

DescriptionCVE.org

AOMEI Cyber Backup Missing Authentication for Critical Function Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of AOMEI Cyber Backup. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the DaoService service, which listens on TCP port 9074 by default. The issue results from the lack of authentication prior to allowing access to functionality. An attacker can leverage this vulnerability to execute code in the context of SYSTEM. Was ZDI-CAN-26158.

AnalysisAI

AOMEI Cyber Backup Missing Authentication for Critical Function Remote Code Execution Vulnerability. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Technical ContextAI

This vulnerability is classified as Missing Authentication for Critical Function (CWE-306), which allows attackers to access critical functionality without authentication. AOMEI Cyber Backup Missing Authentication for Critical Function Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of AOMEI Cyber Backup. Authentication is not required to exploit this vulnerability. The specific flaw exists within the DaoService service, which listens on TCP port 9074 by default. The issue results from the lack of authentication prior to allowing access to functionality. An attacker can leverage this vulnerability to execute code in the context of SYSTEM. Was ZDI-CAN-26158. Affected products include: Aomeitech Cyber Backup.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Require authentication for all sensitive operations, implement defense in depth.