CVE-2021-3275

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in, but needs a user to act. Limited direct impact.

Exploit odds

1.8% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2021-03-26 13:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 04:04 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.8% in the next 30 days (EPSS).
• Severity: 6.1 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2021-03-26 13:15 UTC

Last modified

2026-06-17 04:04 UTC

Exploit probability

1.8% · EPSS, next 30 days

Weakness

CWE-79 · Cross-site scripting

Record status

Modified

Affected

• 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

Attack profile CVSS 3.1 · 6.1

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-3275.md and follow it. Check whether this project is affected by CVE-2021-3275. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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