#VU52009 Improper access control in Aterm WG2600HS and Aterm WX3000HP - CVE-2021-20712

Vulnerability identifier: #VU52009

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-20712

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Aterm WG2600HS
Hardware solutions / Routers & switches, VoIP, GSM, etc
Aterm WX3000HP
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: NEC Corporation

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions in the IPv6 firewall function. A remote attacker can access devices connected to the LAN side from the WAN side.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Aterm WG2600HS: 1.5.1

Aterm WX3000HP: 1.1.2

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External links
https://jvn.jp/en/jp/JVN29739718/index.html
https://jpn.nec.com/security-info/secinfo/nv21-010.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.