Nec Aterm WG2600HS Firmware vulnerabilities

11 CVEs affecting Nec Aterm WG2600HS Firmware, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2026-4622, published 2026-03-27.

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Known exploited (CISA KEV) first, then by EPSS exploit probability.

• CVE-2021-20711, published 2021-04-26. Critical severity, CVSS 9.8. EPSS: 1.4% chance of exploitation in the next 30 days. Aterm WG2600HS firmware Ver1.5.1 and earlier allows an attacker to execute arbitrary OS commands via unspecified vectors.
• CVE-2026-4622, published 2026-03-27. Critical severity, CVSS 9.8. EPSS: 1.2% chance of exploitation in the next 30 days. OS Command Injection vulnerability in NEC Platforms, Ltd. Aterm Series allows a attacker to execute arbitrary OS commands via network.
• CVE-2021-20708, published 2021-04-26. High severity, CVSS 7.2. EPSS: 1.2% chance of exploitation in the next 30 days. NEC Aterm devices (Aterm WF1200CR firmware Ver1.3.2 and earlier, Aterm WG1200CR firmware Ver1.3.3 and earlier, and Aterm WG2600HS firmware Ver1.5.1 and earlier) allow authenticated attackers to…
• CVE-2020-5524, published 2020-02-21. High severity, CVSS 8.8. EPSS: 1% chance of exploitation in the next 30 days. Aterm series (Aterm WF1200C firmware Ver1.2.1 and earlier, Aterm WG1200CR firmware Ver1.2.1 and earlier, Aterm WG2600HS firmware Ver1.3.2 and earlier) allows an attacker on the same network segment…
• CVE-2020-5534, published 2020-02-21. High severity, CVSS 8.0. EPSS: 0.9% chance of exploitation in the next 30 days. Aterm WG2600HS firmware Ver1.3.2 and earlier allows an authenticated attacker on the same network segment to execute arbitrary OS commands with root privileges via unspecified vectors.
• CVE-2020-5525, published 2020-02-21. High severity, CVSS 8.0. EPSS: 0.9% chance of exploitation in the next 30 days. Aterm series (Aterm WF1200C firmware Ver1.2.1 and earlier, Aterm WG1200CR firmware Ver1.2.1 and earlier, Aterm WG2600HS firmware Ver1.3.2 and earlier) allows an authenticated attacker on the same…
• CVE-2020-5533, published 2020-02-21. Medium severity, CVSS 6.1. EPSS: 0.8% chance of exploitation in the next 30 days. Cross-site scripting vulnerability in Aterm WG2600HS firmware Ver1.3.2 and earlier allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
• CVE-2021-20712, published 2021-04-26. Medium severity, CVSS 5.3. EPSS: 0.8% chance of exploitation in the next 30 days. 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…
• CVE-2021-20709, published 2021-04-26. High severity, CVSS 7.2. EPSS: 0.7% chance of exploitation in the next 30 days. Improper validation of integrity check value vulnerability in NEC Aterm WF1200CR firmware Ver1.3.2 and earlier, Aterm WG1200CR firmware Ver1.3.3 and earlier, and Aterm WG2600HS firmware Ver1.5.1 and…
• CVE-2026-4621, published 2026-03-27. Medium severity, CVSS 5.6. EPSS: 0.3% chance of exploitation in the next 30 days. Hidden Functionality vulnerability in NEC Platforms, Ltd. Aterm Series allows a attacker to enable telnet via network.

Latest

• CVE-2026-4309, published 2026-03-27. Medium severity, CVSS 6.5. EPSS: 0.2% chance of exploitation in the next 30 days. Missing Authorization vulnerability in NEC Platforms, Ltd. Aterm Series allows a attacker to get a specific device information and change the settings via network.