CVE-2024-27443

MEDIUM CISA KEV

CVSS v3

6.1

MEDIUM

EPSS Score

—

exploit probability

CISA KEV

Yes

known exploited

Exploitation

—

SSVC status

Description

An issue was discovered in Zimbra Collaboration (ZCS) 9.0 and 10.0. A Cross-Site Scripting (XSS) vulnerability exists in the CalendarInvite feature of the Zimbra webmail classic user interface, because of improper input validation in the handling of the calendar header. An attacker can exploit this via an email message containing a crafted calendar header with an embedded XSS payload. When a victim views this message in the Zimbra webmail classic interface, the payload is executed in the context

CISA Known Exploited Vulnerability

Date Added: 5/19/2025
Patch Due Date: 6/9/2025
Required Action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Technical Details

CVSS v3 Vector: 3.1
Published: 8/12/2024
Last Modified: 10/31/2025

Frequently Asked Questions

What is CVE-2024-27443?

Is CVE-2024-27443 actively exploited?

Yes. CVE-2024-27443 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 6/9/2025.

What is the CVSS score for CVE-2024-27443?

CVE-2024-27443 has a CVSS v3 base score of 6.1 (MEDIUM severity), with vector string 3.1.

Is CVE-2024-27443 affecting your environment?

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