{"id":"CVE-2021-41531","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-41531","generatedAt":"2026-10-27T17:40:18.467Z","title":"NLnet Labs Routinator prior to 0.10.0 produces invalid RTR payload if an RPKI CA uses too large values in the max-length parameter in a ROA.","description":"NLnet Labs Routinator prior to 0.10.0 produces invalid RTR payload if an RPKI CA uses too large values in the max-length parameter in a ROA. This will lead to RTR clients such as routers to reject the RPKI data set, effectively disabling Route Origin Validation.","published":"2021-09-21T14:15:08.000Z","lastModified":"2026-06-17T04:08:36.000Z","status":"Modified","sourceIdentifier":"sep@nlnetlabs.nl","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},"cwe":["CWE-1288","CWE-20"],"affected":["nlnetlabs/routinator"],"epss":{"score":0.0093,"percentile":0.60335,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.93%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://www.nlnetlabs.nl/downloads/routinator/CVE-2021-41531.txt","tags":["Vendor Advisory"],"source":"sep@nlnetlabs.nl"},{"url":"https://www.nlnetlabs.nl/downloads/routinator/CVE-2021-41531.txt","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-41531","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}