CVE-2021-21441Network attack vector

Information disclosure via crafted email rendering

Published Jun 16, 2021 · Updated Sep 16, 2024

Cross-site scripting in OTRS 7.0.0 through 7.0.26 allows remote attackers to disclose information through a crafted email. The ticket overview renderer fails to neutralize script-capable email content before generating the page, causing the payload to execute when the overview is displayed. Sending the email requires no authentication or user interaction; ((OTRS)) Community Edition 6.0.1 and later releases in the 6.0.x line are also affected.

CVSS severity7.5
High
EPSS probability1.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in OTRS 7.0.0 through 7.0.26 allows remote attackers to disclose information through a crafted email. The ticket overview renderer fails to neutralize script-capable email content before generating the page, causing the payload to execute when the overview is displayed. Sending the email requires no authentication or user interaction; ((OTRS)) Community Edition 6.0.1 and later releases in the 6.0.x line are also affected.

The record

CVE
CVE-2021-21441
Published
Jun 16, 2021
Updated
Sep 16, 2024
Vendor
OTRS AG
Product
OTRS
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 16, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.0.x <=7.0.26

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OTRS AG · OTRSversion=7.0.x <=7.0.26
OTRS AG · ((OTRS)) Community Editionversion=6.0.1 <6.0.x*

Published CVSS scores

7.5OTRS AGCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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