CVE-2021-20501

Severity: high (CVSS 8.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-04-21 · updated 2026-06-17

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

IBM i: 7.1, 7.2, 7.3, 7.4

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/198056
https://www.ibm.com/support/pages/node/6445505
https://exchange.xforce.ibmcloud.com/vulnerabilities/198056
https://www.ibm.com/support/pages/node/6445505

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