{"affected":[{"affectedData":[{"product":"i","vendor":"IBM","versions":[{"status":"affected","version":"7.1"},{"status":"affected","version":"7.2"},{"status":"affected","version":"7.3"},{"status":"affected","version":"7.4"}]}],"source":"psirt@us.ibm.com"}],"configurations":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:ibm:i:7.1:*:*:*:*:*:*:*","matchCriteriaId":"75F0F975-DD09-4851-A536-1B8484715FEE","vulnerable":true},{"criteria":"cpe:2.3:o:ibm:i:7.2:*:*:*:*:*:*:*","matchCriteriaId":"BD871157-2BB3-4641-B84E-3EA13D24D35A","vulnerable":true},{"criteria":"cpe:2.3:o:ibm:i:7.3:*:*:*:*:*:*:*","matchCriteriaId":"9A49E8C5-7967-42AE-A787-C533D24A63D7","vulnerable":true},{"criteria":"cpe:2.3:o:ibm:i:7.4:*:*:*:*:*:*:*","matchCriteriaId":"92D03306-B6C9-403E-99A2-CE9D8DC3B482","vulnerable":true}],"negate":false,"operator":"OR"}]}],"cveTags":[],"descriptions":[{"lang":"en","value":"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."},{"lang":"es","value":"IBM i versiones 7.1, 7.2, 7.3 y 7.4 SMTP, permite a un atacante de red enviar correos electrónicos a destinatarios de dominio local inexistentes en el servidor SMTP, debido al uso de una configuración no predeterminada. Un atacante podría explotar esta vulnerabilidad para consumir ancho de banda de red y espacio en disco innecesarios, y permitir a atacantes remotos enviar correo electrónico no deseado.  IBM X-Force ID: 198056"}],"id":"CVE-2021-20501","lastModified":"2026-06-17T03:33:56.270","metrics":{"cvssMetricV2":[{"acInsufInfo":false,"baseSeverity":"MEDIUM","cvssData":{"accessComplexity":"LOW","accessVector":"NETWORK","authentication":"NONE","availabilityImpact":"PARTIAL","baseScore":6.4,"confidentialityImpact":"NONE","integrityImpact":"PARTIAL","vectorString":"AV:N/AC:L/Au:N/C:N/I:P/A:P","version":"2.0"},"exploitabilityScore":10.0,"impactScore":4.9,"obtainAllPrivilege":false,"obtainOtherPrivilege":false,"obtainUserPrivilege":false,"source":"nvd@nist.gov","type":"Primary","userInteractionRequired":false}],"cvssMetricV30":[{"cvssData":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.0"},"exploitabilityScore":2.2,"impactScore":3.6,"source":"psirt@us.ibm.com","type":"Secondary"}],"cvssMetricV31":[{"cvssData":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","version":"3.1"},"exploitabilityScore":3.9,"impactScore":4.2,"source":"nvd@nist.gov","type":"Primary"}]},"published":"2021-04-21T12:15:08.303","references":[{"source":"psirt@us.ibm.com","tags":["VDB Entry","Vendor Advisory"],"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/198056"},{"source":"psirt@us.ibm.com","tags":["Vendor Advisory"],"url":"https://www.ibm.com/support/pages/node/6445505"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["VDB Entry","Vendor Advisory"],"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/198056"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Vendor Advisory"],"url":"https://www.ibm.com/support/pages/node/6445505"}],"sourceIdentifier":"psirt@us.ibm.com","vulnStatus":"Modified","weaknesses":[{"description":[{"lang":"en","value":"NVD-CWE-noinfo"}],"source":"nvd@nist.gov","type":"Primary"}]}