What’s Vulnerable › Vulnerabilities

CVE-2021-3275

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-03-26 · updated 2026-06-17
• Weakness: CWE-79

Description

Unauthenticated stored cross-site scripting (XSS) exists in multiple TP-Link products including WIFI Routers (Wireless AC routers), Access Points, ADSL + DSL Gateways and Routers, which affects TD-W9977v1, TL-WA801NDv5, TL-WA801Nv6, TL-WA802Nv5, and Archer C3150v2 devices through the improper validation of the hostname. Some of the pages including dhcp.htm, networkMap.htm, dhcpClient.htm, qsEdit.htm, and qsReview.htm and use this vulnerable hostname function (setDefaultHostname()) without sanitization.

Affected products

• TP-Link Archer-C3150 Firmware: v2_170926
• TP-Link Td-W9977 Firmware: v1_0.1.0_0.9.1_up_boot(161123)_2016-11-23_15.36.15
• TP-Link Tl-Wa801N Firmware: v6_eu_0.9.1_3.16_up_boot[200116-rel61815]
• TP-Link Tl-Wa801Nd Firmware: v5_us_0.9.1_3.16_up_boot[170905-rel56404]
• TP-LINK TL-WR802N V4(JP): v4_us_0.9.1_3.17_up_boot[200421-rel38950]

References

• http://packetstormsecurity.com/files/161989/TP-Link-Cross-Site-Scripting.html
• https://github.com/smriti548/CVE/blob/main/CVE-2021-3275
• https://seclists.org/fulldisclosure/2021/Mar/67
• https://www.tp-link.com
• http://packetstormsecurity.com/files/161989/TP-Link-Cross-Site-Scripting.html
• https://github.com/smriti548/CVE/blob/main/CVE-2021-3275
• https://seclists.org/fulldisclosure/2021/Mar/67
• https://www.tp-link.com

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