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Vulnerability record · CVE-2021-20680 · published 26 April 2021

CVE-2021-20680: Nec aterm wg1900hp2 firmware cross-site scripting vulnerability

Nec · Aterm Wg1900hp2 Firmware

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.

6.1 CVSS 3.1 Medium EPSS 0.80% · top 44.4% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score, v2 4.3
0.80%EPSS exploitation probability, 30 days
NoNot in CISA KEV
17Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

17 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://jpn.nec.com/security-info/secinfo/nv21-008.html Vendor Advisory
https://jvn.jp/en/jp/JVN67456944/index.html Third Party Advisory
https://jpn.nec.com/security-info/secinfo/nv21-008.html Vendor Advisory
https://jvn.jp/en/jp/JVN67456944/index.html Third Party Advisory

Track CVE-2021-20680 inside VULONE

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2024-28010Nec aterm wg1800hp4 firmware hard-coded password vulnerabilityUse of Hard-coded Password in NEC Corporation Aterm WG1800HP4, WG1200HS3, WG1900HP2, WG1200HP3, WG1800HP3, WG1200HS2, WG1900HP, WG1200HP2, W1200EX(-M…EPSS 0.58%9.8CVE-2024-28015Nec aterm wg1800hp4 firmware os command injection vulnerabilityImproper Neutralization of Special Elements used in an OS Command vulnerability in NEC Corporation Aterm WG1800HP4, WG1200HS3, WG1900HP2, WG1200HP3, …EPSS 0.67%9.8CVE-2024-28008Nec aterm wg1800hp4 firmware vulnerabilityActive Debug Code in NEC Corporation Aterm WG1800HP4, WG1200HS3, WG1900HP2, WG1200HP3, WG1800HP3, WG1200HS2, WG1900HP, WG1200HP2, W1200EX(-MS), WG120…EPSS 0.62%9.8CVE-2024-28011Nec aterm wg1800hp4 firmware vulnerabilityHidden Functionality vulnerability in NEC Corporation Aterm WG1800HP4, WG1200HS3, WG1900HP2, WG1200HP3, WG1800HP3, WG1200HS2, WG1900HP, WG1200HP2, W1…EPSS 0.62%9.8CVE-2024-28009Nec aterm wg1800hp4 firmware improper authentication vulnerabilityImproper authentication vulnerability in NEC Corporation Aterm WG1800HP4, WG1200HS3, WG1900HP2, WG1200HP3, WG1800HP3, WG1200HS2, WG1900HP, WG1200HP2,…EPSS 0.65%9.8CVE-2024-28014Nec aterm wg1800hp4 firmware stack-based buffer overflow vulnerabilityStack-based Buffer Overflow vulnerability in NEC Corporation Aterm WG1800HP4, WG1200HS3, WG1900HP2, WG1200HP3, WG1800HP3, WG1200HS2, WG1900HP, WG1200…EPSS 0.69%9.8CVE-2024-28007Nec aterm wg1800hp4 firmware improper authentication vulnerabilityImproper authentication vulnerability in NEC Corporation Aterm WG1800HP4, WG1200HS3, WG1900HP2, WG1200HP3, WG1800HP3, WG1200HS2, WG1900HP, WG1200HP2,…EPSS 0.65%9.8CVE-2024-28012Nec aterm wg1800hp4 firmware improper authentication vulnerabilityImproper authentication vulnerability in NEC Corporation Aterm WG1800HP4, WG1200HS3, WG1900HP2, WG1200HP3, WG1800HP3, WG1200HS2, WG1900HP, WG1200HP2,…EPSS 0.74%

Source: NIST National Vulnerability Database (record CVE-2021-20680), CISA KEV, FIRST EPSS (scores of 2026-10-16). This page is refreshed as NVD updates the record.