CVE-2025-8611
Published: 20 August 2025
Summary
CVE-2025-8611 is a critical-severity Missing Authentication for Critical Function (CWE-306) vulnerability in Aomeitech Cyber Backup. Its CVSS base score is 9.8 (Critical).
Operationally, ranked in the top 16.8% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
AOMEI Cyber Backup contains a missing authentication vulnerability for a critical function that leads to remote code execution. The flaw resides in the DaoService component, which listens on TCP port 9074 by default, and stems from the absence of any authentication checks before granting access to privileged functionality. Successful exploitation grants an attacker the ability to run arbitrary code in the context of the SYSTEM account on affected installations.
Remote, unauthenticated attackers can exploit the issue over the network by sending specially crafted requests to the exposed service. No user interaction or credentials are required, and the vulnerability carries a CVSS 3.0 score of 9.8, reflecting its critical severity and the high impact on confidentiality, integrity, and availability.
The issue was reported as ZDI-CAN-26158 and is covered by the Zero Day Initiative advisory ZDI-25-807, which security teams should consult for official remediation guidance and patch availability.
EPSS scores for the CVE rose from a low baseline to a recorded peak of 0.0466 before settling at the current value of 0.0181, indicating that exploitation interest increased after public disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-25388
Vulnerability details
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…
more
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.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Requires established identification and authentication to unlock, mitigating missing authentication for continued system access.
Requiring identification and rationale for actions allowed without authentication ensures critical functions are not left unprotected by forcing review of authentication requirements.
Authorizing mobile device connections to organizational systems ensures authentication is performed for this critical access function.
Guarantees critical functions are protected by mandatory invocation of the access control mechanism.
Auditing sessions makes it possible to detect access to critical functions without required authentication.
The assessment process confirms authentication is present and effective for critical functions, preventing exploitation from missing authentication.
Certification assesses that critical functions have required authentication controls in place.
Disabling non-essential functions and services eliminates the need to secure them, reducing exposure from missing authentication on unnecessary components.