Is CVE-2017-5544 actively exploited?

No active exploitation of CVE-2017-5544 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2017-5544 be exploited remotely?

Yes. CVE-2017-5544 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2017-5544?

CVE-2017-5544 has a CVSS score of 5.9 (MEDIUM).

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MEDIUM

CVE-2017-5544

CWE-400Published: January 23, 2017· Updated: Jun 17, 2026

5.9

CVSS v3.1

Official Description

An issue was discovered on FiberHome Fengine S5800 switches V210R240. An unauthorized attacker can access the device's SSH service, using a password cracking tool to establish SSH connections quickly. This will trigger an increase in the SSH login timeout (each of the login attempts will occupy a connection slot for a longer time). Once this occurs, legitimate login attempts via SSH/telnet will be refused, resulting in a denial of service; you must restart the device.

NVD Source

Technical Analysis

CVE-2017-5544 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.9.