Back to Database
Status published
Medium
CVE-2021-20712
Improper access control vulnerability in NEC Aterm WG2600HS firmware Ver1.5.1...
Vulnerability Description
Improper access control vulnerability in NEC Aterm WG2600HS firmware Ver1.5.1 and earlier, and Aterm WX3000HP firmware Ver1.1.2 and earlier allows a device connected to the LAN side to be accessed from the WAN side due to the defect in the IPv6 firewall function.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
THREAT MONITOR
Am I Vulnerable?
Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2021-20712
Credits & Attribution
No credits recorded in the NVD database.
References
More from NEC Corporation
View All →CVE-2025-8153
Cross-site Scripting vulnerability in NEC Corporation UNIVERGE IX from Ver.9.5...
Medium
5.1
CVE-2025-12852
DLL Loading vulnerability in NEC Corporation RakurakuMusen Start EX All...
High
8.4
CVE-2025-11546
CLUSTERPRO X for Linux 4.0, 4.1, 4.2, 5.0, 5.1 and...
Critical
9.3
CVE-2025-0356
NEC Corporation Aterm WX1500HP Ver.1.4.2 and earlier and WX3600HP Ver.1.5.3...
High
7.2
CVE-2025-0355
Missing Authentication for Critical Function vulnerability in NEC Corporation Aterm...
High
7.5
Affected Vendor
NEC Corporation
View all reports →Affected Software
NEC Aterm devices
Vulnerable Versions:
Aterm WG2600HS firmware Ver1.5.1 and earlier, and Aterm WX3000HP firmware Ver1.1.2 and earlier
Timeline
Official Publish:
April 26th, 2021
Last Modified:
August 3rd, 2024
Added to House:
July 21st, 2026
CVSS Vectors
V3:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weaknesses (CWE)
No CWE data available
MITRE ATT&CK TTPs
No associated TTPs found for this vulnerability.