CVE-2024-45519Actively exploitedAdded to KEV 2024-10-03Critical severity, CVSS 9.8

Synacor Zimbra Collaboration Suite (ZCS) Command Execution Vulnerability

Synacor, Zimbra Collaboration Suite (ZCS)

Description

Synacor Zimbra Collaboration Suite (ZCS) contains an unspecified vulnerability in the postjournal service that may allow an unauthenticated user to execute commands.

CVSS severity

Critical (9.8/10)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Sourced from NVD, reflects how severe this vulnerability is if exploited, not whether it has been. Every advisory on this page is already a CISA-confirmed active exploitation case regardless of its CVSS score.

EPSS, exploit probability

Critical

99.9%

estimated chance of real-world exploitation in the next 30 days, higher than 100.0% of every CVE FIRST.org scores

Refreshed 10/28/2026, via FIRST.org's EPSS model, not CVSS, this measures likelihood of exploitation, not how severe it would be.

Public exploit references (via NVD)

134c704f-9b21-4f2e-91b3-4a467353bcc0

Required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

CISA-recommended due date: 2024-10-24

CWE-284

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