{"cve":"CVE-2021-3761","nvd":{"published":"2021-09-09T14:15:09.397","modified":"2026-06-17T04:05:42.900","status":"Modified","description":"Any CA issuer in the RPKI can trick OctoRPKI prior to 1.3.0 into emitting an invalid VRP \"MaxLength\" value, causing RTR sessions to terminate. An attacker can use this to disable RPKI Origin Validation in a victim network (for example AS 13335 - Cloudflare) prior to launching a BGP hijack which during normal operations would be rejected as \"RPKI invalid\". Additionally, in certain deployments RTR session flapping in and of itself also could cause BGP routing churn, causing availability issues.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-787"],"references":["https://github.com/cloudflare/cfrpki/security/advisories/GHSA-c8xp-8mf3-62h9","https://www.debian.org/security/2022/dsa-5041","https://github.com/cloudflare/cfrpki/security/advisories/GHSA-c8xp-8mf3-62h9","https://www.debian.org/security/2022/dsa-5041"],"products":["cloudflare:octorpki","debian:debian_linux"],"source":"nvd","synced_at":"2026-10-19T21:23:41.316049955+00:00"},"epss":{"cve":"CVE-2021-3761","score":0.01216,"percentile":0.68596,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-c8xp-8mf3-62h9","url":"https://osv.dev/vulnerability/GHSA-c8xp-8mf3-62h9","summary":"OctoRPKI lacks contextual out-of-bounds check when validating RPKI ROA maxLength values","modified":"2026-07-08T06:27:57.548504664Z","packages":[{"ecosystem":"Go","name":"github.com/cloudflare/cfrpki","purl":"pkg:golang/github.com/cloudflare/cfrpki","ranges":["<1.3.0"],"fixed":["1.3.0"]}]},{"id":"GO-2022-0246","url":"https://osv.dev/vulnerability/GO-2022-0246","summary":"Insufficient validation in github.com/cloudflare/cfrpki","modified":"2024-05-20T16:03:47Z","packages":[{"ecosystem":"Go","name":"github.com/cloudflare/cfrpki","purl":"pkg:golang/github.com/cloudflare/cfrpki","ranges":["<1.3.0"],"fixed":["1.3.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}