CVE-2016-6554

9.8 CRITICAL 4% exploit odds Fix listed Auth & access Server

What it is

Synology NAS servers DS107, firmware version 3.1-1639 and prior, and DS116, DS213, firmware versions prior to 5.2-5644-1, use non-random default credentials of: guest:(blank) and admin:(blank) . A remote network attacker can gain privileged access to a vulnerable device.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
Exploit odds: 4.1% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2018-07-13 20:29 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 00:51 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 4.1% in the next 30 days (EPSS).
Severity: 9.8 CRITICAL (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2018-07-13 20:29 UTC
Last modified: 2026-06-17 00:51 UTC
Exploit probability: 4.1% · EPSS, next 30 days
Weakness: CWE-255
Record status: Modified

Affected

Synology ds107 Firmware ≤ 3.1-1639
Synology ds213 Firmware ≤ 5.2-5644-1
Synology ds116 Firmware ≤ 5.2-5644-1

Attack profile CVSS 3.0 · 9.8

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Raw vector

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

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record