{"id":"CVE-2020-27222","aliases":["EUVD-2020-19737","GHSA-wfcg-xg9m-fp2f"],"status":"published","title":"In Eclipse Californium version 2.3.0 to 2.6.0, the certificate based (x509 and RPK) DTLS...","description":"In Eclipse Californium version 2.3.0 to 2.6.0, the certificate based (x509 and RPK) DTLS handshakes accidentally fails, because the DTLS server side sticks to a wrong internal state. That wrong internal state is set by a previous certificate based DTLS handshake failure with TLS parameter mismatch. The DTLS server side must be restarted to recover this. This allow clients to force a DoS.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00861,"percentile":0.58971,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-372"],"published":"2021-02-03T15:45:13Z","modified":"2026-10-24T10:30:39Z","products":[{"vendor":"eclipse","product":"californium"},{"vendor":"the eclipse foundation","product":"eclipse californium"}],"references":[{"url":"https://bugs.eclipse.org/bugs/show_bug.cgi?id=570844","tags":["x_refsource_CONFIRM","x_transferred","Permissions Required","Vendor Advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-27222"},{"url":"https://github.com/advisories/GHSA-wfcg-xg9m-fp2f"}],"sources":{"cve":[{"id":"CVE-2020-27222","description":"In Eclipse Californium version 2.3.0 to 2.6.0, the certificate based (x509 and RPK) DTLS handshakes accidentally fails, because the DTLS server side sticks to a wrong internal state. That wrong internal state is set by a previous certificate based DTLS handshake failure with TLS parameter mismatch. The DTLS server side must be restarted to recover this. This allow clients to force a DoS.","status":"published","published":"2021-02-03T15:45:13Z","modified":"2024-08-04T16:11:36Z","cwes":["CWE-372"],"updated_at":"2026-11-02T14:35:53.552996Z"}],"euvd":[{"id":"EUVD-2020-19737","description":"In Eclipse Californium version 2.3.0 to 2.6.0, the certificate based (x509 and RPK) DTLS handshakes accidentally fails, because the DTLS server side sticks to a wrong internal state. That wrong internal state is set by a previous certificate based DTLS handshake failure with TLS parameter mismatch. The DTLS server side must be restarted to recover this. This allow clients to force a DoS.","status":"published","published":"2021-02-03T15:45:13Z","modified":"2024-08-04T16:11:36Z","updated_at":"2026-11-03T03:07:13.515696Z"}],"ghsa":[{"id":"GHSA-wfcg-xg9m-fp2f","title":"In Eclipse Californium version 2.3.0 to 2.6.0, the certificate based (x509 and RPK) DTLS...","description":"In Eclipse Californium version 2.3.0 to 2.6.0, the certificate based (x509 and RPK) DTLS handshakes accidentally fails, because it sticks to a wrong internal state. That wrong internal state is set by a previous certificate based DTLS handshakes failure with TLS parameter mismatch. The server must be restarted to recover this. This allow clients to force a DoS.","status":"published","published":"2022-05-24T17:40:47Z","modified":"2023-01-29T05:05:12Z","updated_at":"2026-11-02T14:45:44.421144Z"}],"nvd":[{"id":"CVE-2020-27222","description":"In Eclipse Californium version 2.3.0 to 2.6.0, the certificate based (x509 and RPK) DTLS handshakes accidentally fails, because the DTLS server side sticks to a wrong internal state. That wrong internal state is set by a previous certificate based DTLS handshake failure with TLS parameter mismatch. The DTLS server side must be restarted to recover this. This allow clients to force a DoS.","status":"published","published":"2021-02-03T16:15:13.117Z","modified":"2026-06-17T03:08:59.54Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-372"],"updated_at":"2026-11-02T14:06:34.188486Z"}],"osv":[{"id":"CVE-2020-27222","description":"In Eclipse Californium version 2.3.0 to 2.6.0, the certificate based (x509 and RPK) DTLS handshakes accidentally fails, because the DTLS server side sticks to a wrong internal state. That wrong internal state is set by a previous certificate based DTLS handshake failure with TLS parameter mismatch. The DTLS server side must be restarted to recover this. This allow clients to force a DoS.","status":"published","published":"2021-02-03T16:15:13.117Z","modified":"2026-10-24T10:30:39.08954974Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:16.248747Z"}]}}