What’s Vulnerable › Vulnerabilities

CVE-2020-35821

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-12-30 · updated 2026-06-17
• Weakness: CWE-79

Description

Certain NETGEAR devices are affected by stored XSS. This affects D7800 before 1.0.1.56, R7800 before 1.0.2.74, R8900 before 1.0.4.28, R9000 before 1.0.4.28, RAX120 before 1.0.0.78, RBK20 before 2.3.5.26, RBR20 before 2.3.5.26, RBS20 before 2.3.5.26, RBK40 before 2.3.5.30, RBR40 before 2.3.5.30, RBS40 before 2.3.5.30, RBK50 before 2.3.5.30, RBR50 before 2.3.5.30, RBS50 before 2.3.5.30, and XR700 before 1.0.1.10.

Affected products

• NETGEAR D7800 Firmware: before 1.0.1.56 — fixed in 1.0.1.56
• NETGEAR R7800 Firmware: before 1.0.2.74 — fixed in 1.0.2.74
• NETGEAR R8900 Firmware: before 1.0.4.28 — fixed in 1.0.4.28
• NETGEAR R9000 Firmware: before 1.0.4.28 — fixed in 1.0.4.28
• NETGEAR Rax120 Firmware: before 1.0.0.78 — fixed in 1.0.0.78
• NETGEAR Rbk20 Firmware: before 2.3.5.26 — fixed in 2.3.5.26
• NETGEAR Rbk40 Firmware: before 2.3.5.30 — fixed in 2.3.5.30
• NETGEAR Rbk50 Firmware: before 2.3.5.30 — fixed in 2.3.5.30
• NETGEAR Rbr20 Firmware: before 2.3.5.26 — fixed in 2.3.5.26
• NETGEAR Rbr40 Firmware: before 2.3.5.30 — fixed in 2.3.5.30
• NETGEAR Rbr50 Firmware: before 2.3.5.30 — fixed in 2.3.5.30
• NETGEAR Rbs20 Firmware: before 2.3.5.26 — fixed in 2.3.5.26
• NETGEAR Rbs40 Firmware: before 2.3.5.30 — fixed in 2.3.5.30
• NETGEAR Rbs50 Firmware: before 2.3.5.30 — fixed in 2.3.5.30
• NETGEAR Xr700 Firmware: before 1.0.1.10 — fixed in 1.0.1.10

How to fix

Upgrade to a fixed version: NETGEAR D7800 Firmware 1.0.1.56; NETGEAR R7800 Firmware 1.0.2.74; NETGEAR R8900 Firmware 1.0.4.28; NETGEAR R9000 Firmware 1.0.4.28; NETGEAR Rax120 Firmware 1.0.0.78; NETGEAR Rbk20 Firmware 2.3.5.26; NETGEAR Rbk40 Firmware 2.3.5.30; NETGEAR Rbk50 Firmware 2.3.5.30; NETGEAR Rbr20 Firmware 2.3.5.26; NETGEAR Rbr40 Firmware 2.3.5.30; NETGEAR Rbr50 Firmware 2.3.5.30; NETGEAR Rbs20 Firmware 2.3.5.26. Check the vendor advisory for mitigations.

References

• https://kb.netgear.com/000062659/Security-Advisory-for-Stored-Cross-Site-Scripting-on-Some-Routers-and-WiFi-Systems-PSV-2018-0497
• https://kb.netgear.com/000062659/Security-Advisory-for-Stored-Cross-Site-Scripting-on-Some-Routers-and-WiFi-Systems-PSV-2018-0497

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