Home/CVE/DoS attack can be performed when an email contains specially designed URL in the body. It can lead to the high CPU usage
CVE

CVE-2021-21439

DoS attack can be performed when an email contains specially designed URL in the body. It can lead to the high CPU usage

DoS attack can be performed when an email contains specially designed URL in the body. It can lead to the high CPU usage and cause low quality of service, or in extreme case bring the system to a halt. 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 7.0.26 and prior versions.

8.0.x version 8.0.13 and prior versions.

MEDIUM · CVSS 6.5 EPSS 0.00348
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  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
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⬡

Weakness Classification

CWE-754Improper Check for Unusual or Exceptional Conditions
CWE-755Improper Handling of Exceptional Conditions
▤

Affected Products & Versions

3
otrs>= 6.0.1 and <= 6.0.30
otrs>= 7.0.0 and < 7.0.27
otrs>= 8.0.0 and < 8.0.14
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · security@otrs.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD14 Jun 2021 · 08:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://lists.debian.org/debian-lts-announce/2023/08/msg00040.html
https://otrs.com/release-notes/otrs-security-advisory-2021-09/Vendor Advisory
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