What’s Vulnerable › Vulnerabilities

CVE-2021-36091: Unautorized access to the calendar appointments

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-07-26 · updated 2026-06-17
• Weakness: CWE-200

Description

Agents are able to list appointments in the calendars without required permissions. This issue affects: OTRS AG ((OTRS)) Community Edition: 6.0.x version 6.0.1 and later versions. OTRS AG OTRS: 7.0.x versions prior to 7.0.27.

Affected products

• OTRS AG OTRS: from 6.0.0 before 6.0.32; from 7.0.0 before 7.0.28 — fixed in 6.0.32, 7.0.28

How to fix

Upgrade to a fixed version: OTRS AG OTRS 6.0.32, 7.0.28. Check the vendor advisory for mitigations.

References

• https://lists.debian.org/debian-lts-announce/2023/08/msg00040.html
• https://otrs.com/release-notes/otrs-security-advisory-2021-14/
• https://lists.debian.org/debian-lts-announce/2023/08/msg00040.html
• https://otrs.com/release-notes/otrs-security-advisory-2021-14/

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