5.9
Medium
CVE-2021-20501 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…
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.
Affected products and versions
Other CVEs of i
The 215 CVEs of i →
CVE-2026-102618
IBM i is Affected by a Protection Mechanism Failure
3.6
Low
CVE-2026-93744
IBM i 7.3, 7.4, 7.5, and 7.6 could allow an unathenticated remote attacker to bypass security restrictions due to…
6.5
Medium
CVE-2026-17068
IBM i 7.3, 7.4, 7.5, and 7.6 could allow a local attacker to bypass NFS version restrictions due to improper enforcement…
5.4
Medium
CVE-2026-17073
IBM i 7.3, 7.4, 7.5, and 7.6 could allow a local attacker to obtain sensitive information due to missing subtree…
5.4
Medium