CVE-2021-3275

Name: CVE-2021-3275
Creator: NVD / NIST
Published: 2021-03-26T13:15:11.663+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 1.79%

Last modified Jun 17, 2026

CVE-2021-3275 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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.. EPSS estimates a 1.79% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

1.79%

75.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Tp-Link	Td-W9977 Firmware	v1_0.1.0_0.9.1_up_boot\(161123\)_2016-11-23_15.36.15
Tp-Link	Tl-Wa801nd Firmware	v5_us_0.9.1_3.16_up_boot\[170905-rel56404\]
Tp-Link	Tl-Wa801n Firmware	v6_eu_0.9.1_3.16_up_boot\[200116-rel61815\]
Tp-Link	Tl-Wr802n Firmware	v4_us_0.9.1_3.17_up_boot\[200421-rel38950\]
Tp-Link	Archer-C3150 Firmware	v2_170926

References

http://packetstormsecurity.com/files/161989/TP-Link-Cross-Site-Scripting.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/smriti548/CVE/blob/main/CVE-2021-3275Exploit, Third Party Advisory
https://seclists.org/fulldisclosure/2021/Mar/67Exploit, Mailing List, Third Party Advisory
https://www.tp-link.comVendor Advisory
http://packetstormsecurity.com/files/161989/TP-Link-Cross-Site-Scripting.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/smriti548/CVE/blob/main/CVE-2021-3275Exploit, Third Party Advisory
https://seclists.org/fulldisclosure/2021/Mar/67Exploit, Mailing List, Third Party Advisory
https://www.tp-link.comVendor Advisory

Timeline

Published: Mar 26, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3275?

How severe is CVE-2021-3275?

CVE-2021-3275 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.79% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3275?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3275?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST