What is CVE-2021-21441?

CVE-2021-21441 is a high-severity vulnerability in Otrs, classified under Cross-site Scripting. CVSS score: 7.5/10. Published 2021-06-16.

How severe is CVE-2021-21441?

High severity. CVSS v3 base score is 7.5 out of 10.

XSS in Otrs

CVE-2021-21441

There is a XSS vulnerability in the ticket overview screens. It's possible to collect various information by having an e-mail shown in the overview screen. Attack can be performed by sending specially crafted e-mail to the system and it doesn't require any user intraction. 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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-06-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.011 (64.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.011 · change: -0.001

Affected products

Otrs
Otrs Ag — versions 7.0.x
Otrs Ag ((Otrs)) Community Edition — versions 6.0.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

otrs.com/release-notes/otrs-security-advisory-2021-11/ (Release Notes, Vendor Advisory)
lists.debian.org/debian-lts-announce/2023/08/msg00040.html (mailing-list)

Frequently asked questions

What is CVE-2021-21441?: CVE-2021-21441 is a high-severity vulnerability in Otrs, classified under Cross-site Scripting. CVSS score: 7.5/10. Published 2021-06-16.
How severe is CVE-2021-21441?: High severity. CVSS v3 base score is 7.5 out of 10.