CVE-2021-20680: Nec Aterm w1200ex-Ms Firmware

Medium severity, CVSS 6.1. EPSS: 0.8% chance of exploitation in the next 30 days.

Cross-site scripting vulnerability in NEC Aterm devices (Aterm WG1900HP2 firmware Ver.1.3.1 and earlier, Aterm WG1900HP firmware Ver.2.5.1 and earlier, Aterm WG1800HP4 firmware Ver.1.3.1 and earlier, Aterm WG1800HP3 firmware Ver.1.5.1 and earlier, Aterm WG1200HS2 firmware Ver.2.5.0 and earlier, Aterm WG1200HP3 firmware Ver.1.3.1 and earlier, Aterm WG1200HP2 firmware Ver.2.5.0 and earlier, Aterm W1200EX firmware Ver.1.3.1 and earlier, Aterm W1200EX-MS firmware Ver.1.3.1 and earlier, Aterm WG1200HS firmware all versions Aterm WG1200HP firmware all versions Aterm WF800HP firmware all versions Aterm WF300HP2 firmware all versions Aterm WR8165N firmware all versions Aterm W500P firmware all versions, and Aterm W300P firmware all versions) allows remote attackers to inject arbitrary script or HTML via unspecified vectors.

Affected products

• Nec Aterm w1200ex-Ms Firmware: up to and including 1.3.1
• Nec Aterm w1200ex Firmware: up to and including 1.3.1
• Nec Aterm w300p Firmware: any version
• Nec Aterm w500p Firmware: any version
• Nec Aterm WF300HP2 Firmware: any version
• Nec Aterm WF800HP Firmware: any version
• Nec Aterm WG1200HP2 Firmware: up to and including 2.5.0
• Nec Aterm WG1200HP3 Firmware: up to and including 1.3.1
• Nec Aterm WG1200HP Firmware: any version
• Nec Aterm WG1200HS2 Firmware: up to and including 2.5.0
• Nec Aterm WG1200HS3 Firmware: up to and including 1.1.2
• Nec Aterm WG1200HS Firmware: any version
• Nec Aterm WG1800HP3 Firmware: up to and including 1.5.1
• Nec Aterm WG1800HP4 Firmware: up to and including 1.3.1
• Nec Aterm WG1900HP2 Firmware: up to and including 1.3.1
• Nec Aterm WG1900HP Firmware: up to and including 2.5.1
• Nec Aterm WR8165N Firmware: any version

Published 2021-04-26. Last modified 2026-06-17.