What is the severity of CVE-2021-20501?

CVE-2021-20501 has a medium severity rating due to the potential for network resource consumption.

How do I fix CVE-2021-20501?

To mitigate CVE-2021-20501, review and adjust the SMTP server configuration to prevent emails to non-existent local-domain recipients.

What versions of IBM i are affected by CVE-2021-20501?

CVE-2021-20501 affects IBM i versions 7.1, 7.2, 7.3, and 7.4.

What impact does CVE-2021-20501 have on network resources?

CVE-2021-20501 can lead to excessive consumption of network bandwidth and disk space.

Can CVE-2021-20501 be exploited remotely?

Yes, CVE-2021-20501 can be exploited by remote attackers through the SMTP server.

Vulnerability/
CVE-2021-20501

high

8.2

20/4/2021

21/4/2021

17/9/2024

CVE-2021-20501

First published: Tue Apr 20 2021(Updated: )

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.

Credit: psirt@us.ibm.com

Affected Software	Affected Version	How to fix
IBM OS/400	=7.1
IBM OS/400	=7.2
IBM OS/400	=7.3
IBM OS/400	=7.4
IBM OS/400	<=7.4
IBM OS/400	<=7.3
IBM OS/400	<=7.2
IBM OS/400	<=7.1

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

IBM-6445505

Frequently Asked Questions

What is the severity of CVE-2021-20501?
CVE-2021-20501 has a medium severity rating due to the potential for network resource consumption.
How do I fix CVE-2021-20501?
To mitigate CVE-2021-20501, review and adjust the SMTP server configuration to prevent emails to non-existent local-domain recipients.
What versions of IBM i are affected by CVE-2021-20501?
CVE-2021-20501 affects IBM i versions 7.1, 7.2, 7.3, and 7.4.
What impact does CVE-2021-20501 have on network resources?
CVE-2021-20501 can lead to excessive consumption of network bandwidth and disk space.
Can CVE-2021-20501 be exploited remotely?
Yes, CVE-2021-20501 can be exploited by remote attackers through the SMTP server.

agent/references
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agent/softwarecombine
agent/first-publish-date
agent/severity
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agent/source
agent/tags
collector/nvd-index
agent/software-canonical-lookup-request
collector/ibm-support
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vendor/ibm
canonical/ibm os/400
version/ibm os/400/7.1
version/ibm os/400/7.2
version/ibm os/400/7.3
version/ibm os/400/7.4

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Frequently Asked Questions

What is the severity of CVE-2021-20501?
CVE-2021-20501 has a medium severity rating due to the potential for network resource consumption.
How do I fix CVE-2021-20501?
To mitigate CVE-2021-20501, review and adjust the SMTP server configuration to prevent emails to non-existent local-domain recipients.
What versions of IBM i are affected by CVE-2021-20501?
CVE-2021-20501 affects IBM i versions 7.1, 7.2, 7.3, and 7.4.
What impact does CVE-2021-20501 have on network resources?
CVE-2021-20501 can lead to excessive consumption of network bandwidth and disk space.
Can CVE-2021-20501 be exploited remotely?
Yes, CVE-2021-20501 can be exploited by remote attackers through the SMTP server.