{"schema_version":"1.9.0","id":"BIT-nginx-gateway-2021-23017","published":"2025-12-03T11:44:13.520Z","modified":"2026-09-08T08:48:16.238502790Z","aliases":["BIT-nginx-2021-23017","CVE-2021-23017"],"details":"A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process crash or potential other impact.","affected":[{"package":{"name":"nginx-gateway","ecosystem":"Bitnami","purl":"pkg:bitnami/nginx-gateway"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.6.18"},{"fixed":"1.20.1"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/nginx-gateway/BIT-nginx-gateway-2021-23017.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"}]}],"references":[{"type":"ADVISORY","url":"http://mailman.nginx.org/pipermail/nginx-announce/2021/000300.html"},{"type":"ADVISORY","url":"http://packetstormsecurity.com/files/167720/Nginx-1.20.0-Denial-Of-Service.html"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r37e6b2165f7c910d8e15fd54f4697857619ad2625f56583802004009%40%3Cnotifications.apisix.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r4d4966221ca399ce948ef34884652265729d7d9ef8179c78d7f17e7f%40%3Cnotifications.apisix.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r6fc5c57b38e93e36213e9a18c8a4e5dbd5ced1c7e57f08a1735975ba%40%3Cnotifications.apisix.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rf232eecd47fdc44520192810560303073cefd684b321f85e311bad31%40%3Cnotifications.apisix.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rf318aeeb4d7a3a312734780b47de83cefb7e6995da0b2cae5c28675c%40%3Cnotifications.apisix.apache.org%3E"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7SFVYHC7OXTEO4SMBWXDVK6E5IMEYMEE/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GNKOP2JR5L7KCIZTJRZDCUPJTUONMC5I/"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-23017"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20210708-0006/"},{"type":"WEB","url":"https://support.f5.com/csp/article/K12331123%2C"},{"type":"ADVISORY","url":"https://www.oracle.com/security-alerts/cpuapr2022.html"},{"type":"ADVISORY","url":"https://www.oracle.com/security-alerts/cpujan2022.html"},{"type":"ADVISORY","url":"https://www.oracle.com/security-alerts/cpuoct2021.html"}],"database_specific":{"cpes":["cpe:2.3:a:f5:nginx:*:*:*:*:*:*:*:*"],"severity":"High"}}