CVE-2021-21439 — Possible DoS attack using a special crafted URL in email body

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.

Affected products

Vendor	Product	Affected	Fixed
OTRS	((OTRS)) Community Edition	6.0.1 – < 6.0.x*	6.0.x*
OTRS	OTRS	7.0.x – ≤ 7.0.26, 8.0.x – ≤ 8.0.13	—

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗

Release	Package	Fixed in	Advisory
Debian 11	otrs2	6.0.32-5	—
Debian 10	otrs2	6.0.16-2+deb10u1	DLA-3551-1

Ubuntu