{"schemaVersion":3,"id":"CVE-2021-3125","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"In TP-Link TL-XDR3230 < 1.0.12, TL-XDR1850 < 1.0.9, TL-XDR1860 < 1.0.14, TL-XDR3250 < 1.0.2, TL-XDR6060 Turbo < 1.1.8, TL-XDR5430 < 1.0.11, and possibly others, when IPv6 is used, a routing loop can occur that generates excessive network traffic between an affected device and its upstream ISP's router. This occurs when a link prefix route points to a point-to-point link, a destination IPv6 address belongs to the prefix and is not a local IPv6 address, and a router advertisement is received with at least one global unique IPv6 prefix for which the on-link flag is set.","dates":{"published":"2021-04-12T17:41:04.000Z","modified":"2024-08-03T16:45:51.234Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":4.3,"severity":"medium","vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.015,"percentile":0.74084,"severity":"low","asOf":"2026-10-22T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-22T00:00:00.000Z","baselineScore":0.015},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.015,"percentile":0.74084}],"last30":[{"date":"2026-09-22T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.015,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.015,"percentile":0.74084}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-834","name":"Excessive Iteration","description":"The product performs an iteration or loop without sufficiently limiting the number of times that the loop is executed.","type":"weakness","status":"Incomplete","abstraction":"Class","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/834.html"}],"affected":[{"vendor":"tp-link","product":"tl-xdr1850_firmware","name":"tl-xdr1850 firmware","label":"tl-xdr1850_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 1.0.9","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.0.9","eol":null,"hubHref":"/vendor/tp-link/tl-xdr1850"},{"vendor":"tp-link","product":"tl-xdr1860_firmware","name":"tl-xdr1860 firmware","label":"tl-xdr1860_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 1.0.14","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.0.14","eol":null,"hubHref":"/vendor/tp-link/tl-xdr1860"},{"vendor":"tp-link","product":"tl-xdr3230_firmware","name":"tl-xdr3230 firmware","label":"tl-xdr3230_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 1.0.12","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.0.12","eol":null,"hubHref":"/vendor/tp-link/tl-xdr3230"},{"vendor":"tp-link","product":"tl-xdr3250_firmware","name":"tl-xdr3250 firmware","label":"tl-xdr3250_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 1.0.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.0.2","eol":null,"hubHref":"/vendor/tp-link/tl-xdr3250"},{"vendor":"tp-link","product":"tl-xdr5430_firmware","name":"tl-xdr5430 firmware","label":"tl-xdr5430_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 1.0.11","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.0.11","eol":null,"hubHref":"/vendor/tp-link/tl-xdr5430"},{"vendor":"tp-link","product":"tl-xdr6060_firmware","name":"tl-xdr6060 firmware","label":"tl-xdr6060_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 1.1.8","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.1.8","eol":null,"hubHref":"/vendor/tp-link/tl-xdr6060"}],"affectedCount":6,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://service.tp-link.com.cn/detail_download_8724.html","label":"service.tp-link.com.cn/detail_download_8724.html","hostname":"service.tp-link.com.cn","tags":["X Refsource MISC","Vendor Advisory"]},{"url":"https://service.tp-link.com.cn/detail_download_8723.html","label":"service.tp-link.com.cn/detail_download_8723.html","hostname":"service.tp-link.com.cn","tags":["X Refsource MISC","Vendor Advisory"]},{"url":"https://service.tp-link.com.cn/detail_download_8719.html","label":"service.tp-link.com.cn/detail_download_8719.html","hostname":"service.tp-link.com.cn","tags":["X Refsource MISC","Vendor Advisory"]},{"url":"https://service.tp-link.com.cn/detail_download_8722.html","label":"service.tp-link.com.cn/detail_download_8722.html","hostname":"service.tp-link.com.cn","tags":["X Refsource MISC","Vendor Advisory"]},{"url":"https://service.tp-link.com.cn/detail_download_8725.html","label":"service.tp-link.com.cn/detail_download_8725.html","hostname":"service.tp-link.com.cn","tags":["X Refsource MISC","Vendor Advisory"]},{"url":"https://service.tp-link.com.cn/detail_download_8720.html","label":"service.tp-link.com.cn/detail_download_8720.html","hostname":"service.tp-link.com.cn","tags":["X Refsource MISC","Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2021-04-12T17:41:04.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-03T16:45:51.234Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T21:47:10.362Z","stale":false,"partial":false}}