{"id":"CVE-2021-20501","aliases":["EUVD-2021-7919","GHSA-5c9g-84hr-f4w2"],"status":"published","title":"IBM i 7.1, 7.2, 7.3, and 7.4 SMTP allows a network attacker to send emails to non-existent local...","description":"IBM i 7.1, 7.2, 7.3, and 7.4 SMTP allows a network attacker to send emails to non-existent local-domain recipients to the SMTP server, caused by using a non-default configuration. An attacker could exploit this vulnerability to consume unnecessary network bandwidth and disk space, and allow remote attackers to send spam email. IBM X-Force ID: 198056.","severity":{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/C:N/S:U/AC:H/A:H/UI:N/I:N/PR:N/RC:C/E:U/RL:O","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.01386,"percentile":0.72619,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-400"],"published":"2021-04-21T12:05:22Z","modified":"2026-06-17T03:33:56Z","products":[{"vendor":"ibm","product":"i"}],"references":[{"url":"https://www.ibm.com/support/pages/node/6445505","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/198056","tags":["vdb-entry","x_refsource_XF","x_transferred","VDB Entry","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20501"},{"url":"https://github.com/advisories/GHSA-5c9g-84hr-f4w2"}],"sources":{"cve":[{"id":"CVE-2021-20501","description":"IBM i 7.1, 7.2, 7.3, and 7.4 SMTP allows a network attacker to send emails to non-existent local-domain recipients to the SMTP server, caused by using a non-default configuration. An attacker could exploit this vulnerability to consume unnecessary network bandwidth and disk space, and allow remote attackers to send spam email. IBM X-Force ID: 198056.","status":"published","published":"2021-04-21T12:05:22.224Z","modified":"2024-09-17T00:35:46.205Z","cvss":[{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/C:N/S:U/AC:H/A:H/UI:N/I:N/PR:N/RC:C/E:U/RL:O","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:32:55.564736Z"}],"euvd":[{"id":"EUVD-2021-7919","description":"IBM i 7.1, 7.2, 7.3, and 7.4 SMTP allows a network attacker to send emails to non-existent local-domain recipients to the SMTP server, caused by using a non-default configuration. An attacker could exploit this vulnerability to consume unnecessary network bandwidth and disk space, and allow remote attackers to send spam email. IBM X-Force ID: 198056.","status":"published","published":"2021-04-21T12:05:22Z","modified":"2024-09-17T00:35:46Z","cvss":[{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/C:N/S:U/AC:H/A:H/UI:N/I:N/PR:N/RC:C/E:U/RL:O","level":"medium"}],"updated_at":"2026-11-03T00:28:57.917597Z"}],"ghsa":[{"id":"GHSA-5c9g-84hr-f4w2","title":"IBM i 7.1, 7.2, 7.3, and 7.4 SMTP allows a network attacker to send emails to non-existent local...","description":"IBM i 7.1, 7.2, 7.3, and 7.4 SMTP allows a network attacker to send emails to non-existent local-domain recipients to the SMTP server, caused by using a non-default configuration. An attacker could exploit this vulnerability to consume unnecessary network bandwidth and disk space, and allow remote attackers to send spam email. IBM X-Force ID: 198056.","status":"published","published":"2022-05-24T17:48:05Z","modified":"2023-01-27T05:03:00Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:42:09.126228Z"}],"nvd":[{"id":"CVE-2021-20501","description":"IBM i 7.1, 7.2, 7.3, and 7.4 SMTP allows a network attacker to send emails to non-existent local-domain recipients to the SMTP server, caused by using a non-default configuration. An attacker could exploit this vulnerability to consume unnecessary network bandwidth and disk space, and allow remote attackers to send spam email. IBM X-Force ID: 198056.","status":"published","published":"2021-04-21T12:15:08.303Z","modified":"2026-06-17T03:33:56.27Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high","assessor":"primary"},{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"},{"version":"2.0","score":6.4,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:52.03307Z"}]}}