{"id":"ALPINE-CVE-2021-39921","details":"NULL pointer exception in the Modbus dissector in Wireshark 3.4.0 to 3.4.9 and 3.2.0 to 3.2.17 allows denial of service via packet injection or crafted capture file","modified":"2026-11-03T06:32:41.199008253Z","published":"2021-11-19T17:15:08.343Z","upstream":["CVE-2021-39921"],"references":[{"type":"ADVISORY","url":"https://security.alpinelinux.org/vuln/CVE-2021-39921"}],"affected":[{"package":{"name":"wireshark","ecosystem":"Alpine:v3.15","purl":"pkg:apk/alpine/wireshark?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.2.0"},{"fixed":"3.4.13-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-39921.json"}},{"package":{"name":"wireshark","ecosystem":"Alpine:v3.16","purl":"pkg:apk/alpine/wireshark?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.2.0"},{"fixed":"3.4.11-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-39921.json"}},{"package":{"name":"wireshark","ecosystem":"Alpine:v3.17","purl":"pkg:apk/alpine/wireshark?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.2.0"},{"fixed":"3.4.11-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-39921.json"}},{"package":{"name":"wireshark","ecosystem":"Alpine:v3.18","purl":"pkg:apk/alpine/wireshark?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.2.0"},{"fixed":"3.4.11-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-39921.json"}},{"package":{"name":"wireshark","ecosystem":"Alpine:v3.19","purl":"pkg:apk/alpine/wireshark?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.2.0"},{"fixed":"3.4.11-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-39921.json"}},{"package":{"name":"wireshark","ecosystem":"Alpine:v3.20","purl":"pkg:apk/alpine/wireshark?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.2.0"},{"fixed":"3.4.11-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-39921.json"}},{"package":{"name":"wireshark","ecosystem":"Alpine:v3.21","purl":"pkg:apk/alpine/wireshark?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.2.0"},{"fixed":"3.4.11-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-39921.json"}},{"package":{"name":"wireshark","ecosystem":"Alpine:v3.22","purl":"pkg:apk/alpine/wireshark?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.2.0"},{"fixed":"3.4.11-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-39921.json"}},{"package":{"name":"wireshark","ecosystem":"Alpine:v3.23","purl":"pkg:apk/alpine/wireshark?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.2.0"},{"fixed":"3.4.11-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-39921.json"}},{"package":{"name":"wireshark","ecosystem":"Alpine:v3.24","purl":"pkg:apk/alpine/wireshark?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.2.0"},{"fixed":"3.4.11-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-39921.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}