Archer AX21 v2

Slowing down well evidenced

updates are coming less often than this product's own history

376 days since the last release against a median gap of 136 (2.8x)

Last firmware: 18 September 2025 (1 year ago)
Releases seen: 9
Update rhythm: about every 4 months
Support observed: ≥5 years
Vendor's promise: no support period we can evaluate
Patch latency: not measurable — its changelogs name no CVE ids

Which one do I have?

TP-Link ships this model in more than one hardware revision, and they do not share firmware. The revision is printed on the label on the underside, usually after the model — Ver 1.0, V4.6. Getting it wrong is the easiest way to read the wrong answer here.

Archer AX21 v1.2 (US) Slowing down 12 releases
Archer AX21 v1.26 (US) Gone quiet 2 releases
Archer AX21 v2 Gone quiet 1 releases
Archer AX21 v2.6 (US) Slowing down 5 releases
Archer AX21 v3 (US) Gone quiet 8 releases
Archer AX21 v3.6 (US) Gone quiet 7 releases
Archer AX21 v4 Not enough evidence 0 releases
Archer AX21 v4.6 (US) Slowing down 5 releases
Archer AX21 v5.46 (US) Not enough evidence 1 releases
Archer AX21 v5.6 (US) Gone quiet 3 releases

Firmware history

Archer AX21(US)_V2_2.1.9 Build 20250424 18 September 2025
Release notes — disclosure 0.11
```
Enhancements 1. Improved overall security and stability.
```
Archived page, fetched 29 September 2026

Archer AX21(US)_V2_2.1.8 Build 20230829 31 August 2023

Release notes — disclosure 0.42

This update is recommended for all users and provides important security updates Modifications and Bug Fixes 1. Enhance device security; 2. Improve the stability of the equipment.

Archived page, fetched 29 September 2026

Archer AX21(US)_V2_230426 27 April 2023
Release notes — disclosure 0.25
```
Note: 1. Improved system stability 2. Fixed some security issues
```
Archived page, fetched 29 September 2026

Archer AX21(US)_V2_2.1.7 Build 20221125 2 December 2022

Release notes — disclosure 0.58

New Features/Enhancement: 1. Enhance device security; 2. Fixed the bug that if you manually configure DNS for IPv4 in PPPoE co-session scenarios, the ISP DNS is still configured for domain name resolution; 3. Fixed the bug that the RA configuration does not take effect correctly in specific cases during IPv6; 4. Fixed the bug that when enabling PPPoEV6, the field carried by PPPoE dial-up does not contain the service name; 5. Fixed the bug that the TimeMachine does not work under Macos13.1.

Archived page, fetched 29 September 2026

Archer AX21(US)_V2_211231 28 January 2022

Release notes — disclosure 0.53

Enhancement: 1.Improved wired and wireless stability; 2.Maximum wireless devices on single band increased to 128; 3.Updated dnsmasq version. Bug Fixed: 1.Fixed the bug that the router has unstable Internet connection in some cases; 2.Fixed the bugs on the Web UI; 3.Fixed the bug that parent control will take affect one hour earlier after the end of daylight saving time.

Archived page, fetched 29 September 2026

Archer AX21(US)_V2_210901 5 November 2021

Release notes — disclosure 0.61

New Features/Enhancement: 1. Improved the wireless performance; 2. Improved the stability of USB sharing feature; 3. Optimized VPN Client and VPN Server feature; 4. Enhanced the security of HTTPS web page; 5. Updated dropbear version and changed the dropbear port; 6. Updated openssl version; 7. Improved the stability of OneMesh feature. Bug Fixed: 1.Fixed the bugs related to IPTV feature; 2.Fixed the bug that static routing can't set gateway as 0.0.0.0; 3.Fixed the bugs related to AP mode; 4.Fixed the bug that the router can't get WAN IP in some cases; 5.Fixed the bug that WAN pc can get access to the Windows shared folder after disabling DMZ in some cases; 6.Fixed the bugs on the Web UI; 7.Fixed the bugs related to Smart Connect; 8.Fixed the bug related to GDRP encryption.

Archived page, fetched 29 September 2026

Archer AX21(US)_V2_210521 14 July 2021

Release notes — disclosure 0.60

New Features/Enhancement: 1. Increased the maximum number of black and white lists for the Parent Control feature to 64; 2. Improved the configuration process of Quick Setup; Bug Fixed: 1. Fixed the FragAttacks vulnerabilities; 2. Fixed the PPTP VPN vulnerabilities; 3. Fixed the display bug related to OneMesh; 4. Fixed the bug that PPTP and L2TP client cannot connect to the server in some cases; 5. Fixed the display bug related to the Client Lists in some cases; 6. Fixed the bug that iPhone will be switched from 5GHz to 2.4GHz in some cases;

Archived page, fetched 29 September 2026

Archer AX21(US)_V2_210325 1 June 2021

Release notes — disclosure 0.64

New Features/Enhancement: 1. Added VPN Client and VPN Server feature; 2. Added QoS Schedule feature; 3. Added a prompt when the negotiation rate of WAN port is 100Mbps; 4. Adjusted configuration items and display items on the Tether APP and the web UI; 5. Optimized the Client List; 6. Optimized the Parental Control feature; 7. Optimized coverage of 2.4G network; 8. Optimized compatibility with some ISPs. Bug Fixed: 1. Fixed some bugs that could cause the router to crash or reboot; 2. Fixed the bug that the router incorrectly blocked Internet requests; 3. Fixed the bug that RE300 could not synchronize the wireless schedule setting of the main network; 4. Fixed the bug that some Apps can access USB drive without entering the user and the password; 5. Fixed the bug that the hostname is displayed as a messy code or asterisks; 6. Fixed the bug of failed to save system log in AP mode; 7. Fixed the bug that the router still suggested the client to connect to the 5G network when the 5G network had reached the maximum number of connections after Smart Connect was enabled; 8. Fixed the bug that the LED Control setting is invalid after rebooting the router; 9. Fixed the bug of IP&MAC Binding and Static Route failure after changing IPv6 settings; 10. Fixed the bug that the Clients can not be displayed on Tether APP after the PLC with OneMesh feature is connected to the network.

Archived page, fetched 29 September 2026

Archer AX21(US)_V2_201203 16 December 2020
Release notes — disclosure 0.31
```
First firmware released for Archer AX21(US) V2.0
```
Archived page, fetched 29 September 2026

Evidence

One archived page sits behind this record, the earliest read on 1 August 2026. Everything above was read from it, and each is kept byte for byte so it can be checked after the vendor edits the original.

Identifiers: marketing_name Archer AX21

Judged by lifecycle-1 on 29 September 2026. How these verdicts are computed.

Machine-readable: JSON · RSS