{"id":"CVE-2021-21727","aliases":["EUVD-2021-8899","GHSA-8q85-4h38-w789"],"status":"published","title":"A ZTE product has a DoS vulnerability. A remote attacker can amplify traffic by sending carefully...","description":"A ZTE product has a DoS vulnerability. A remote attacker can amplify traffic by sending carefully constructed IPv6 packets to the affected devices, which eventually leads to device denial of service. This affects:\u003cZXHN F623\u003e\u003cAll versions up to V6.0.0P3T33\u003e","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":"2026-11-12","score":0.01437,"percentile":0.73511,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-03-29T15:41:42Z","modified":"2026-06-17T03:36:02Z","products":[{"vendor":"zte","product":"zxhn_f623_firmware"}],"references":[{"url":"https://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1014744","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21727"},{"url":"https://github.com/advisories/GHSA-8q85-4h38-w789"}],"sources":{"cve":[{"id":"CVE-2021-21727","description":"A ZTE product has a DoS vulnerability. A remote attacker can amplify traffic by sending carefully constructed IPv6 packets to the affected devices, which eventually leads to device denial of service. This affects:\u003cZXHN F623\u003e\u003cAll versions up to V6.0.0P3T33\u003e","status":"published","published":"2021-03-29T15:41:42Z","modified":"2024-08-03T18:23:29.287Z","updated_at":"2026-11-02T14:33:00.488332Z"}],"euvd":[{"id":"EUVD-2021-8899","description":"A ZTE product has a DoS vulnerability. A remote attacker can amplify traffic by sending carefully constructed IPv6 packets to the affected devices, which eventually leads to device denial of service. This affects:\u003cZXHN F623\u003e\u003cAll versions up to V6.0.0P3T33\u003e","status":"published","published":"2021-03-29T15:41:42Z","modified":"2024-08-03T18:23:29Z","updated_at":"2026-11-03T03:25:05.131984Z"}],"ghsa":[{"id":"GHSA-8q85-4h38-w789","title":"A ZTE product has a DoS vulnerability. A remote attacker can amplify traffic by sending carefully...","description":"A ZTE product has a DoS vulnerability. A remote attacker can amplify traffic by sending carefully constructed IPv6 packets to the affected devices, which eventually leads to device denial of service. This affects:\u003cZXHN F623\u003e\u003cAll versions up to V6.0.0P3T33\u003e","status":"published","published":"2022-05-24T17:45:37Z","modified":"2023-01-29T05:07:00Z","updated_at":"2026-11-02T14:46:08.233339Z"}],"nvd":[{"id":"CVE-2021-21727","description":"A ZTE product has a DoS vulnerability. A remote attacker can amplify traffic by sending carefully constructed IPv6 packets to the affected devices, which eventually leads to device denial of service. This affects:\u003cZXHN F623\u003e\u003cAll versions up to V6.0.0P3T33\u003e","status":"published","published":"2021-03-29T16:15:13.133Z","modified":"2026-06-17T03:36:02.94Z","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":7.8,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","level":"high","assessor":"primary"}],"updated_at":"2026-11-02T14:06:51.197859Z"}]}}