CVE-2021-36093

DoS attack using PostMaster filters

Description

It's possible to create an email which can be stuck while being processed by PostMaster filters, causing DoS. This issue affects: OTRS AG ((OTRS)) Community Edition 6.0.x version 6.0.1 and later versions. OTRS AG OTRS 7.0.x version 7.0.28 and prior versions; 8.0.x version 8.0.15 and prior versions.

Remediation

Solution:

  • Update to OTRS 8.0.16, OTRS 7.0.29.

Category

5.3
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.47%
Vendor Advisory otrs.com
Affected: OTRS AG ((OTRS)) Community Edition
Affected: OTRS AG OTRS
Published at:
Updated at:

References

Link Tags
https://otrs.com/release-notes/otrs-security-advisory-2021-16/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-36093?
CVE-2021-36093 has been scored as a medium severity vulnerability.
How to fix CVE-2021-36093?
To fix CVE-2021-36093: Update to OTRS 8.0.16, OTRS 7.0.29.
Is CVE-2021-36093 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-36093 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-36093?
CVE-2021-36093 affects OTRS AG ((OTRS)) Community Edition, OTRS AG OTRS.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.