{"id":"CVE-2020-14447","aliases":["BIT-mattermost-2020-14447","EUVD-2020-6585","GHSA-7rg9-h64j-gpgc"],"status":"published","title":"An issue was discovered in Mattermost Server before 5.23.0. Large webhook requests allow...","description":"An issue was discovered in Mattermost Server before 5.23.0. Large webhook requests allow attackers to cause a denial of service (infinite loop), aka MMSA-2020-0021.","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":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.01114,"percentile":0.66264,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-835"],"published":"2020-06-19T13:04:19Z","modified":"2026-10-24T10:30:45Z","fixes":[{"ecosystem":"Bitnami","package":"mattermost","fixed_in":["5.23.0"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"mattermost","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"5.23.0"}]}]}],"products":[{"vendor":"mattermost","product":"mattermost_server"}],"references":[{"url":"https://mattermost.com/security-updates/","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","web","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-14447","tags":["web"]},{"url":"https://github.com/advisories/GHSA-7rg9-h64j-gpgc"}],"sources":{"cve":[{"id":"CVE-2020-14447","description":"An issue was discovered in Mattermost Server before 5.23.0. Large webhook requests allow attackers to cause a denial of service (infinite loop), aka MMSA-2020-0021.","status":"published","published":"2020-06-19T13:04:19Z","modified":"2024-08-04T12:46:34.187Z","updated_at":"2026-11-02T14:35:46.873079Z"}],"euvd":[{"id":"EUVD-2020-6585","description":"An issue was discovered in Mattermost Server before 5.23.0. Large webhook requests allow attackers to cause a denial of service (infinite loop), aka MMSA-2020-0021.","status":"published","published":"2020-06-19T13:04:19Z","modified":"2024-08-04T12:46:34Z","updated_at":"2026-11-03T03:07:34.099541Z"}],"ghsa":[{"id":"GHSA-7rg9-h64j-gpgc","title":"An issue was discovered in Mattermost Server before 5.23.0. Large webhook requests allow...","description":"An issue was discovered in Mattermost Server before 5.23.0. Large webhook requests allow attackers to cause a denial of service (infinite loop), aka MMSA-2020-0021.","status":"published","published":"2022-05-24T17:21:16Z","modified":"2023-01-29T05:03:07Z","updated_at":"2026-11-02T14:45:14.655741Z"}],"nvd":[{"id":"CVE-2020-14447","description":"An issue was discovered in Mattermost Server before 5.23.0. Large webhook requests allow attackers to cause a denial of service (infinite loop), aka MMSA-2020-0021.","status":"published","published":"2020-06-19T14:15:11.183Z","modified":"2026-06-17T02:54:47.59Z","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":"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-835"],"updated_at":"2026-11-02T14:06:07.249892Z"}],"osv":[{"id":"CVE-2020-14447","description":"An issue was discovered in Mattermost Server before 5.23.0. Large webhook requests allow attackers to cause a denial of service (infinite loop), aka MMSA-2020-0021.","status":"published","published":"2020-06-19T14:15:11.183Z","modified":"2026-10-24T10:30:45.346873571Z","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":"2026-11-02T15:44:14.418339Z"},{"id":"BIT-mattermost-2020-14447","description":"An issue was discovered in Mattermost Server before 5.23.0. Large webhook requests allow attackers to cause a denial of service (infinite loop), aka MMSA-2020-0021.","status":"published","published":"2024-03-06T11:06:44.278Z","modified":"2025-04-03T14:40:37.652Z","updated_at":"2026-11-02T15:28:33.072289Z"}]}}