Vulnerability Monitor

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CVE-2016-10227

Zyxel USG50 Security Appliance and NWA3560-N Access Point allow remote attackers to cause a denial of service (CPU consumption) via a flood of ICMPv4 Port Unreachable packets.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.5, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 4 products from zyxel, from zyxel, from zyxel and 1 other, organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2017, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2017-02-21T07:59:00.157

Last Modified

2025-04-20T01:37:25.860

Status

Deferred

Source

[email protected]

Severity

CVSSv3.0: 7.5 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: COMPLETE

Exploitability Score

10.0

Impact Score

6.9

Weaknesses

Type: Primary
CWE-399

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	zyxel	usg50_firmware	-	Yes
Hardware	zyxel	usg50	-	No
Operating System	zyxel	nwa3560-n_firmware	-	Yes
Hardware	zyxel	nwa3560-n	-	No

References

http://www.securityfocus.com/bid/97105 ([email protected])
http://www.zyxel.com/support/announcement_blacknurse_attack.shtml Patch, Vendor Advisory ([email protected])
https://cxsecurity.com/issue/WLB-2017020177 Exploit, Third Party Advisory ([email protected])
http://www.securityfocus.com/bid/97105 (af854a3a-2127-422b-91ae-364da2661108)
http://www.zyxel.com/support/announcement_blacknurse_attack.shtml Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://cxsecurity.com/issue/WLB-2017020177 Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For zyxel's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.