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 the SMTP server, caused by using a non-default configuration.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.34%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.2 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
- EPSS
- 1.34% probability · 70th percentile
- CISA KEV
- Not listed
- Affected
- ibm/i
- Source
- psirt@us.ibm.com
References
- https://exchange.xforce.ibmcloud.com/vulnerabilities/198056VDB Entry, Vendor Advisory
- https://www.ibm.com/support/pages/node/6445505Vendor Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/198056VDB Entry, Vendor Advisory
- https://www.ibm.com/support/pages/node/6445505Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.