{"slug":"tplink-archer-c20-v4","display_name":"Archer C20","model_name":"Archer C20","hardware_revision":"v4","region_code":"US","category":"other","vendor":{"slug":"tplink","name":"TP-Link"},"verdict":{"status":"slowing","label":"Slowing down","confidence":"medium","reason":"617 days since the last release against a median gap of 1445 (0.4x) — but a year without firmware is not active whatever the cadence","algorithm_version":"lifecycle-1","computed_at":"2026-09-30T00:14:37.542673+00:00","thresholds":{"quiet_days":730,"active_max_days":365,"active_multiple":1.5,"slowing_multiple":3.0,"max_gap_dispersion":1.0,"high_confidence_releases":5,"min_releases_for_cadence":3,"never_updated_min_age_days":365}},"measurements":{"release_count":3,"first_release_date":"2017-02-22","last_release_date":"2025-01-21","days_since_last_release":617,"median_gap_days":1445.0,"cadence_multiple":0.427,"observed_support":{"days":2890,"is_floor":true,"measured_from":"first_release"},"promise":{"end_date":null,"is_estimated":false,"is_floor":false,"honoured":null,"basis":"no_eol_announcement"},"cve_patch_latency_days":{"median":null,"measurable":false}},"releases":[{"version":"Archer C20(US)_V4_250117","channel":"stable","claimed_release_date":"2025-01-21","claimed_date_precision":"day","is_vendor_dated":true,"first_observed_at":"2026-08-01T18:37:57.630436+00:00","observation_kind":"live_crawl","withdrawn_at":null,"changelog":"Enhance device security.","disclosure_score":0.3,"mentions_security":true,"cve_ids":[],"download_url":"https://static.tp-link.com/upload/firmware/2025/202501/20250121/Archer_C20v4_US_0.9.1_4.16_up_boot[250117-rel63441].zip","evidence":{"id":201849,"source_url":"https://www.tp-link.com/us/support/download/archer-c20/v4/","fetched_at":"2026-09-29T02:10:55.513795+00:00","observed_at":"2026-09-29T02:10:55.513795+00:00","http_status":200,"content_sha256":"0c9091de67c5838da11d53bd94399d90245cfe61796e01e606bb58fd908d069d","html":"//firmwarewatch.cc/evidence/201849","raw":"//firmwarewatch.cc/evidence/201849/raw"}},{"version":"Archer C20(US)_V4_190103","channel":"stable","claimed_release_date":"2019-02-20","claimed_date_precision":"day","is_vendor_dated":true,"first_observed_at":"2026-08-01T18:37:57.630436+00:00","observation_kind":"live_crawl","withdrawn_at":null,"changelog":"Modifications and Bug Fixes New Features/Enhancement: 1. Add AP mode. 2. Add LED Schedule function. 3. Add Reboot Schedule function. 4. Add display of port status. 5. Add the support for https. 6. Optimize PPPoE function. 7. Optimize NTP function. 8. Optimize IPv6 function. 9. Improve the stability of device. Bug fixes: 1. Fix the issue that L2TP connection is unstable in some scenarios. 2. Fix the CSRF/XSRF vulnerability. Notes 1. For Archer C20(US) V4. 2. The current settings will be lost after upgrading to this firmware and the old backup file cannot be imported directly. Please reconfigure the router manually.","disclosure_score":0.6,"mentions_security":true,"cve_ids":[],"download_url":"https://static.tp-link.com/2019/201902/20190220/Archer C20(US)_V4_190103.zip","evidence":{"id":201849,"source_url":"https://www.tp-link.com/us/support/download/archer-c20/v4/","fetched_at":"2026-09-29T02:10:55.513795+00:00","observed_at":"2026-09-29T02:10:55.513795+00:00","http_status":200,"content_sha256":"0c9091de67c5838da11d53bd94399d90245cfe61796e01e606bb58fd908d069d","html":"//firmwarewatch.cc/evidence/201849","raw":"//firmwarewatch.cc/evidence/201849/raw"}},{"version":"Archer C20(US)_V4_170222","channel":"stable","claimed_release_date":"2017-02-22","claimed_date_precision":"day","is_vendor_dated":true,"first_observed_at":"2026-08-25T02:00:00.191624+00:00","observation_kind":"live_crawl","withdrawn_at":null,"changelog":"Modifications and Bug Fixes: First Firmware Released.","disclosure_score":0.06,"mentions_security":false,"cve_ids":[],"download_url":"https://static.tp-link.com/Archer C20(US)_V4_170222.zip","evidence":{"id":201849,"source_url":"https://www.tp-link.com/us/support/download/archer-c20/v4/","fetched_at":"2026-09-29T02:10:55.513795+00:00","observed_at":"2026-09-29T02:10:55.513795+00:00","http_status":200,"content_sha256":"0c9091de67c5838da11d53bd94399d90245cfe61796e01e606bb58fd908d069d","html":"//firmwarewatch.cc/evidence/201849","raw":"//firmwarewatch.cc/evidence/201849/raw"}}],"identifiers":[{"kind":"marketing_name","value":"Archer C20","normalized":"archer c20"},{"kind":"openwrt_id","value":"tplink_archer-c20-v4","normalized":"TPLINKARCHERC20V4"}],"revisions":[{"slug":"tplink-archer-c20-v1","hardware_revision":"v1","region_code":""},{"slug":"tplink-archer-c20-v5","hardware_revision":"v5","region_code":"US"},{"slug":"tplink-archer-c20-v5-6-cpi","hardware_revision":"v5.6","region_code":"CPI"},{"slug":"tplink-archer-c20-v5-6-us","hardware_revision":"v5.6","region_code":"US"},{"slug":"tplink-archer-c20-v5-8-us","hardware_revision":"v5.8","region_code":"US"},{"slug":"tplink-archer-c20-v6-46-cpi","hardware_revision":"v6.46","region_code":"CPI"},{"slug":"tplink-archer-c20-v6-6-cpi","hardware_revision":"v6.6","region_code":"CPI"}],"evidence":{"archived_pages":2,"first_observed_at":"2026-08-01T18:37:57.630436+00:00"},"caveats":["observed_support.days is a lower bound: it runs from the first firmware we saw, because no source here publishes launch dates.","Patch latency is not computable for this product: its changelogs name no CVE ids."],"links":{"html":"//firmwarewatch.cc/devices/tplink-archer-c20-v4","self":"//firmwarewatch.cc/api/v1/products/tplink-archer-c20-v4.json","vendor":"//firmwarewatch.cc/api/v1/vendors/tplink.json","feed":"//firmwarewatch.cc/feeds/devices/tplink-archer-c20-v4.xml","methodology":"//firmwarewatch.cc/api/v1/methodology.json"}}