Medium severity · published Jun 14, 2021
CVE-2021-21439
DoS attack can be performed when an email contains specially designed URL in the body
6.5
CVSS
0.9%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 59% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OT
Otrs · Otrs
6.0.1 through 6.0.30; 7.0.0 before 7.0.27; 8.0.0 before 8.0.14 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-21439
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-21439
lists.debian.org
https://lists.debian.org/debian-lts-announce/2023/08/msg00040.html
Vendor Advisory
https://otrs.com/release-notes/otrs-security-advisory-2021-09/
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