CVE-2017-16673: Datto Backup Agent 1.0.6.0 and earlier does not authenticate incoming connections

Q: How do I fix CVE-2017-16673?

backup agent: upgrade to newer than 1.0.6.0. Exact commands for each OS are on this page.

Q: Is CVE-2017-16673 being exploited?

CVE-2017-16673 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2017-16673 affect?

CVE-2017-16673 affects backup agent. Severity is medium (CVSS 5.3). Datto Backup Agent 1.0.6.0 and earlier does not authenticate incoming connections. This allows an attacker to impersonate a Datto Backup Appliance to "pair" with the agent and issue requests to this agent, if the attacker can reach the agen

Q: How urgent is CVE-2017-16673?

Priority 28/100. No elevated risk signals yet.

Routine

MEDIUM 5.3UPGRADE

CVE-2017-16673 is a medium-severity flaw (CVSS 5.3) affecting backup agent. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Datto Backup Agent 1.0.6.0 and earlier does not authenticate incoming connections. This allows an attacker to impersonate a Datto Backup Appliance to "pair" with the agent and issue requests to this agent, if the attacker can reach the agent on TCP port 25566 or 25568, and send unspecified "specific information" by which the agent identifies a network device that is "appearing to be a valid Datto."

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Adjacent network
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 62%)
CISA exploited list	No
Weakness	CWE-200
Published	2017-11-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: datto

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

Am I affected?

Timeline

2017-11-09 04:29 UTCPublished CVE record published
2026-06-17 01:09 UTCUpdated Record last modified

datto backup agent UPGRADE

Affected: <= 1.0.6.0

Fixed in: newer than 1.0.6.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.0.6.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade backup-agent

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade backup-agent

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2017-16673?

backup agent: upgrade to newer than 1.0.6.0. Exact commands for each OS are on this page.

Is CVE-2017-16673 being exploited?

CVE-2017-16673 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-2017-16673 affect?

CVE-2017-16673 affects backup agent. Severity is medium (CVSS 5.3). Datto Backup Agent 1.0.6.0 and earlier does not authenticate incoming connections. This allows an attacker to impersonate a Datto Backup Appliance to "pair" with the agent and issue requests to this agent, if the attacker can reach the agen

How urgent is CVE-2017-16673?

Priority 28/100. No elevated risk signals yet.

References

← Back to latest CVEs