{"id":"CVE-2021-21723","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-21723","generatedAt":"2026-10-28T02:58:41.795Z","title":"Some ZTE products have a DoS vulnerability.","description":"Some ZTE products have a DoS vulnerability. Due to the improper handling of memory release in some specific scenarios, a remote attacker can trigger the vulnerability by performing a series of operations, resulting in memory leak, which may eventually lead to device denial of service. This affects: ZXR10 9904, ZXR10 9908, ZXR10 9916, ZXR10 9904-S, ZXR10 9908-S; all versions up to V1.01.10.B12.","published":"2021-01-26T18:16:19.000Z","lastModified":"2026-06-17T03:36:03.000Z","status":"Modified","sourceIdentifier":"psirt@zte.com.cn","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:N/A:H"},"cwe":["CWE-401"],"affected":["zte/zxr10 9904 firmware","zte/zxr10 9908 firmware","zte/zxr10 9916 firmware","zte/zxr10 9904-s firmware","zte/zxr10 9908-s firmware"],"epss":{"score":0.01209,"percentile":0.68196,"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 (1.21%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"http://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1014424","tags":["Vendor Advisory"],"source":"psirt@zte.com.cn"},{"url":"http://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1014424","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-21723","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."}