{"id":"CVE-2021-33586","aliases":["ALPINE-CVE-2021-33586","DEBIAN-CVE-2021-33586","EUVD-2021-20272","GHSA-mjhp-8mjg-4p7m"],"status":"published","title":"InspIRCd 3.8.0 through 3.9.x before 3.10.0 allows any user (able to connect to the server) to...","description":"InspIRCd 3.8.0 through 3.9.x before 3.10.0 allows any user (able to connect to the server) to access recently deallocated memory, aka the \"malformed PONG\" issue.","severity":{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.0089,"percentile":0.59638,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-732"],"published":"2021-05-27T05:00:36Z","modified":"2026-11-03T06:32:34Z","fixes":[{"ecosystem":"Alpine:v3.20","package":"inspircd","fixed_in":["3.10.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"inspircd","fixed_in":["3.10.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"inspircd","fixed_in":["3.10.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"inspircd","fixed_in":["3.10.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"inspircd","fixed_in":["3.10.0-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"inspircd","fixed_in":["3.8.1-2"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"inspircd","fixed_in":["3.8.1-2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.20","package":"inspircd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.8.0"},{"fixed":"3.10.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.21","package":"inspircd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.8.0"},{"fixed":"3.10.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"inspircd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.8.0"},{"fixed":"3.10.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"inspircd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.8.0"},{"fixed":"3.10.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"inspircd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.8.0"},{"fixed":"3.10.0-r0"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"inspircd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.8.1-2"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"inspircd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.8.1-2"}]}]}],"products":[{"vendor":"inspircd","product":"inspircd"}],"references":[{"url":"https://docs.inspircd.org/security/2021-01/","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory","fix"]},{"url":"https://github.com/inspircd/inspircd/commit/4350a11c663b0d75f8119743bffb7736d87abd4d","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://security.gentoo.org/glsa/202107-22","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33586"},{"url":"https://github.com/advisories/GHSA-mjhp-8mjg-4p7m"},{"url":"https://security.alpinelinux.org/vuln/CVE-2021-33586","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-33586","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2021-33586","description":"InspIRCd 3.8.0 through 3.9.x before 3.10.0 allows any user (able to connect to the server) to access recently deallocated memory, aka the \"malformed PONG\" issue.","status":"published","published":"2021-05-27T05:00:36Z","modified":"2024-08-03T23:50:43.02Z","updated_at":"2026-11-02T14:33:10.204494Z"}],"euvd":[{"id":"EUVD-2021-20272","description":"InspIRCd 3.8.0 through 3.9.x before 3.10.0 allows any user (able to connect to the server) to access recently deallocated memory, aka the \"malformed PONG\" issue.","status":"published","published":"2021-05-27T05:00:36Z","modified":"2024-08-03T23:50:43Z","updated_at":"2026-11-03T03:24:33.866739Z"}],"ghsa":[{"id":"GHSA-mjhp-8mjg-4p7m","title":"InspIRCd 3.8.0 through 3.9.x before 3.10.0 allows any user (able to connect to the server) to...","description":"InspIRCd 3.8.0 through 3.9.x before 3.10.0 allows any user (able to connect to the server) to access recently deallocated memory, aka the \"malformed PONG\" issue.","status":"published","published":"2022-05-24T19:03:31Z","modified":"2023-01-29T05:06:47Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-732"],"updated_at":"2026-11-02T14:46:05.929333Z"}],"nvd":[{"id":"CVE-2021-33586","description":"InspIRCd 3.8.0 through 3.9.x before 3.10.0 allows any user (able to connect to the server) to access recently deallocated memory, aka the \"malformed PONG\" issue.","status":"published","published":"2021-05-27T05:15:06.993Z","modified":"2026-06-17T03:54:49.877Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-732"],"updated_at":"2026-11-02T14:06:53.987491Z"}],"osv":[{"id":"ALPINE-CVE-2021-33586","description":"InspIRCd 3.8.0 through 3.9.x before 3.10.0 allows any user (able to connect to the server) to access recently deallocated memory, aka the \"malformed PONG\" issue.","status":"published","published":"2021-05-27T05:15:06.993Z","modified":"2026-11-03T06:32:34.135623598Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-03T07:17:20.312441Z"},{"id":"CVE-2021-33586","description":"InspIRCd 3.8.0 through 3.9.x before 3.10.0 allows any user (able to connect to the server) to access recently deallocated memory, aka the \"malformed PONG\" issue.","status":"published","published":"2021-05-27T05:15:06.993Z","modified":"2026-10-20T14:23:25.997644044Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:20.13324Z"},{"id":"DEBIAN-CVE-2021-33586","description":"InspIRCd 3.8.0 through 3.9.x before 3.10.0 allows any user (able to connect to the server) to access recently deallocated memory, aka the \"malformed PONG\" issue.","status":"published","published":"2021-05-27T05:15:06.993Z","modified":"2026-10-23T18:04:49.763500583Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:35.233346Z"}]}}