CVE-2021-36093

DoS attack using PostMaster filters

MEDIUM
5.3
CVSS Score
Published: September 6, 2021 at 01:15 PM UTC
Updated: June 17, 2026 at 03:58 AM UTC
1 product affected across 1 vendorOTRS

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Severity
MEDIUM5.3
Exploit prediction
EPSS 1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v ≥ 6.0.16.0.1 ≤ v < 6.0.x*7.0.0 ≤ v < 7.0.297.0.x ≤ v ≤ 7.0.288.0.0 ≤ v < 8.0.168.0.x ≤ v ≤ 8.0.156.0.17.0.x8.0.x
Affected range stops below 6.0.x*, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.0.29, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.0.16, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (1)

CVSS

5.3MEDIUMOTRS
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-185NVD-CWE-noinfo

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