{"id":"CVE-2021-39923","aliases":["AZL-7411","DEBIAN-CVE-2021-39923","DLA-2849-1","DSA-5019-1","EUVD-2021-26279","GHSA-v75m-35ph-56m2","UBUNTU-CVE-2021-39923"],"status":"published","title":"NULL pointer exception in the IPPUSB dissector in Wireshark 3.4.0 to 3.4.9 allows denial of...","description":"Large loop in the PNRP 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","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":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.0161,"percentile":0.76255,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-476","CWE-834"],"published":"2021-11-19T16:31:03Z","modified":"2026-10-24T10:51:25Z","fixes":[{"ecosystem":"Azure Linux:2","package":"wireshark","fixed_in":["3.4.14-1"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"wireshark","fixed_in":["3.6.0-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"wireshark","fixed_in":["3.6.0-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"wireshark","fixed_in":["3.6.0-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Azure Linux:2","package":"wireshark","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.14-1"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"wireshark","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.0-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"wireshark","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.0-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"wireshark","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.0-1"}]}]},{"source":"osv","ecosystem":"Debian:9","package":"wireshark","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.6.20-0+deb9u2"}]}],"versions":["2.2.6+g32dac6a-2","2.2.6+g32dac6a-2+deb9u1","2.2.6+g32dac6a-2+deb9u2","2.2.6+g32dac6a-2+deb9u3","2.2.7-1","2.4.0-1","2.4.1-1","2.4.2-1","2.4.3-1","2.4.4-1","2.4.5-1","2.4.6-1","2.6.1-1","2.6.10-1","2.6.2-1","2.6.2-2","2.6.20-0+deb9u1","2.6.3-1","2.6.3-1~deb9u1","2.6.4-1","2.6.4-2","2.6.5-1","2.6.5-1~deb9u1","2.6.6-1","2.6.7-1","2.6.7-1~deb9u1","2.6.8-1","2.6.8-1.1","2.6.8-1.1~deb9u1","2.6.9-1"],"bundled":9},{"source":"osv","ecosystem":"Debian:11","package":"wireshark","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.10-0+deb11u1"}]}],"versions":["3.4.4-1","3.4.6-1~exp1","3.4.7-1","3.4.7-1~exp1","3.4.8-1","3.4.9-1"],"bundled":12},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"wireshark","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.2-1","1.10.3-1","1.10.5-1ubuntu1","1.10.5-2","1.10.6-1","1.12.1+g01b65bf-4+deb8u11ubuntu0.14.04.1","2.6.3-1~ubuntu14.04.1","2.6.4-2~ubuntu14.04.1","2.6.5-1~ubuntu14.04.1","2.6.6-1~ubuntu14.04.0","2.6.8-1~ubuntu14.04.0~esm1","2.6.10-1~ubuntu14.04.0~esm1","2.6.10-1~ubuntu14.04.0~esm2","2.6.10-1~ubuntu14.04.0~esm3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"wireshark","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.12.7+g7fc8978-1","1.12.8+g5b6e543-2","2.0.1+g59ea380-3build1","2.0.2+ga16e22e-1","2.2.6+g32dac6a-2ubuntu0.16.04","2.6.3-1~ubuntu16.04.1","2.6.4-2~ubuntu16.04.0","2.6.5-1~ubuntu16.04.0","2.6.6-1~ubuntu16.04.0","2.6.8-1~ubuntu16.04.0","2.6.10-1~ubuntu16.04.0","2.6.10-1~ubuntu16.04.0+esm1","2.6.10-1~ubuntu16.04.0+esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"wireshark","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.2-1","2.4.3-1","2.4.4-1","2.4.5-1","2.6.3-1~ubuntu18.04.1","2.6.4-2~ubuntu18.04.0","2.6.5-1~ubuntu18.04.0","2.6.6-1~ubuntu18.04.0","2.6.8-1~ubuntu18.04.0","2.6.10-1~ubuntu18.04.0","2.6.10-1~ubuntu18.04.0+esm1","2.6.10-1~ubuntu18.04.0+esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"wireshark","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.5-1","3.0.7-1","3.2.1-1","3.2.2-1","3.2.3-1","3.2.3-1ubuntu0.1~esm1","3.2.3-1ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"wireshark","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.4.7-1~exp1","3.4.9-1","3.6.2-1ubuntu1","3.6.2-2","3.6.2-2ubuntu0.1~esm1"]}],"products":[{"vendor":"debian","product":"debian_linux"},{"vendor":"wireshark","product":"wireshark"},{"vendor":"wireshark foundation","product":"wireshark"}],"references":[{"url":"https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39923.json","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory","report"]},{"url":"https://www.wireshark.org/security/wnpa-sec-2021-11.html","tags":["x_refsource_MISC","x_transferred","Vendor Advisory","advisory"]},{"url":"https://gitlab.com/wireshark/wireshark/-/issues/17684","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Patch","Vendor Advisory","fix"]},{"url":"https://www.debian.org/security/2021/dsa-5019","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred","Third Party Advisory","advisory"]},{"url":"https://lists.debian.org/debian-lts-announce/2021/12/msg00015.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-39923","tags":["web"]},{"url":"https://gitlab.com/wireshark/wireshark/-/issues/17705","tags":["report"]},{"url":"https://www.wireshark.org/security/wnpa-sec-2021-15.html","tags":["report"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/A6AJFIYIHS3TYDD2EBYBJ5KKE52X34BJ/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YEWTIRMC2MFQBZ2O5M4CJHJM4JPBHLXH/"},{"url":"https://github.com/advisories/GHSA-v75m-35ph-56m2"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-39923","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-39923","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-39923","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-39923","description":"Large loop in the PNRP 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","status":"published","published":"2021-11-19T16:31:03Z","modified":"2024-08-04T02:20:34.19Z","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":"cna"}],"updated_at":"2026-11-02T14:33:09.540052Z"}],"euvd":[{"id":"EUVD-2021-26279","description":"Large loop in the PNRP 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","status":"published","published":"2021-11-19T16:31:03Z","modified":"2024-08-04T02:20:34Z","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":"2026-11-03T03:24:21.810275Z"}],"ghsa":[{"id":"GHSA-v75m-35ph-56m2","title":"NULL pointer exception in the IPPUSB dissector in Wireshark 3.4.0 to 3.4.9 allows denial of...","description":"NULL pointer exception in the IPPUSB dissector in Wireshark 3.4.0 to 3.4.9 allows denial of service via packet injection or crafted capture file","status":"published","published":"2021-11-20T00:00:52Z","modified":"2023-02-01T05:06:14Z","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"}],"cwes":["CWE-476","CWE-834"],"updated_at":"2026-11-02T14:50:19.669171Z"}],"nvd":[{"id":"CVE-2021-39923","description":"Large loop in the PNRP 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","status":"published","published":"2021-11-19T17:15:08.457Z","modified":"2026-06-17T04:04:26.03Z","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":"secondary"},{"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-834"],"updated_at":"2026-11-02T14:07:01.428028Z"}],"osv":[{"id":"AZL-7411","title":"CVE-2021-39923 affecting package wireshark for versions less than 3.4.14-1","description":"Large loop in the PNRP 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","status":"published","published":"2021-11-19T17:15:08Z","modified":"2026-04-21T04:38:40.52238Z","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":"2026-11-02T15:28:09.474476Z"},{"id":"CVE-2021-39923","description":"Large loop in the PNRP 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","status":"published","published":"2021-11-19T17:15:08.457Z","modified":"2026-10-24T10:51:25.429949083Z","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":"2026-11-02T15:44:21.249056Z"},{"id":"DEBIAN-CVE-2021-39923","description":"Large loop in the PNRP 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","status":"published","published":"2021-11-19T17:15:08.457Z","modified":"2026-10-23T18:04:00.215854527Z","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":"2026-11-02T15:45:35.521549Z"},{"id":"UBUNTU-CVE-2021-39923","description":"Large loop in the PNRP 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","status":"published","published":"2021-11-19T17:15:00Z","modified":"2026-04-22T13:00:42.929887Z","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"},{"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":"2026-11-02T15:54:28.526929Z"},{"id":"DLA-2849-1","title":"wireshark - security update","status":"published","published":"2021-12-26T00:00:00Z","modified":"2026-03-09T01:18:41.994062Z","updated_at":"2026-11-02T15:46:11.189256Z"},{"id":"DSA-5019-1","title":"wireshark - security update","status":"published","published":"2021-12-10T00:00:00Z","modified":"2026-03-09T02:09:49.342213Z","updated_at":"2026-11-02T15:46:17.543497Z"}]}}