CVE-2025-8611: AOMEI Cyber Backup Missing Authentication for Critical Function Remote Code Execution Vulnerability

This month

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2025-8611 is a critical-severity flaw (CVSS 9.8) affecting cyber backup. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 a

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 49%)
CISA exploited list	No
Weakness	CWE-306
Published	2025-08-20
Last modified	2026-06-17

Publisher (CNA): Zero Day Initiative · Vendor: aomeitech

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-08-20 17:15 UTCPublished CVE record published
2026-06-17 10:07 UTCUpdated Record last modified

aomeitech cyber backup DOWNGRADE

Affected: 3.7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.7.0

1. Check installed version

apt-cache policy cyber-backup || rpm -q cyber-backup || cyber-backup --version

2. No fixed release: DOWNGRADE to a release before 3.7.0 (Debian / Ubuntu)

apt-cache madison cyber-backup sudo apt install cyber-backup=<VERSION_BEFORE_3.7.0> sudo apt-mark hold cyber-backup

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list cyber-backup sudo dnf downgrade cyber-backup-<VERSION_BEFORE_3.7.0> sudo dnf versionlock add cyber-backup

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-8611?

cyber backup: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-8611 being exploited?

CVE-2025-8611 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-8611 affect?

CVE-2025-8611 affects cyber backup. Severity is critical (CVSS 9.8). 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

How urgent is CVE-2025-8611?

Priority 52/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-8610 CRITICAL 9.8 DOWNGRADE AOMEI Cyber Backup Missing Authentication for Critical Function Remote Code Execution Vulnerability

References

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