CVE-2021-20501

HIGH

IBM i 7.1-7.4 - Denial of Service via SMTP Non-Existent Recipient Handling

Title source: llm

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.

References (2)

Core 2

Core References

Vendor Advisory x_refsource_confirm

https://www.ibm.com/support/pages/node/6445505

VDB Entry, Vendor Advisory vdb-entry x_refsource_xf

https://exchange.xforce.ibmcloud.com/vulnerabilities/198056

Scores

CVSS v3 8.2

EPSS 0.0134

EPSS Percentile 68.1%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Details

Status published

Products (4)

ibm/i 7.1

ibm/i 7.2

ibm/i 7.3

ibm/i 7.4

Published Apr 21, 2021

Tracked Since Feb 18, 2026