CVE-2021-20680 Cross-site scripting in NEC Aterm devices

Medium 6.1 Published 26 Apr 2021 Updated 3 Aug 2024

Remote attackers can inject arbitrary scripts into NEC Aterm routers, potentially compromising user sessions and device security.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2021-20680?

CVE-2021-20680 is a medium-severity cross-site scripting vulnerability in NEC Aterm devices, published on 26 Apr 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

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.

Weakness: CWE-79

Which versions are affected by CVE-2021-20680?

It affects 17 products.

Products include Nec Aterm W1200ex-Ms Firmware, Nec Aterm W1200ex Firmware, Nec Aterm W300p Firmware, Nec Aterm W500p Firmware, Nec Aterm Wf300hp2 Firmware, Nec Aterm Wf800hp Firmware and 11 more.

How do I fix CVE-2021-20680?

No fix has been published for CVE-2021-20680 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2021-20680 being exploited?

There is no known exploitation of CVE-2021-20680 in the wild and no public exploit code.

Sources

Also known as GHSA-qrw9-9x9v-8v9p.