---
title: "CVE-2024-45519: Synacor Zimbra Collaboration Suite (ZCS) Command Execution Vulnerability"
url: https://erroneo.us/security/cve/CVE-2024-45519/
description: "CVE-2024-45519 (Synacor Zimbra Collaboration Suite (ZCS)): Exploited in the wild (CISA KEV). The postjournal service in Zimbra Collaboration (ZCS) before…"
type: vulnerability-record
section: "Security Digest"
date_published: 2024-10-02
date_modified: 2026-02-03
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-45519"
kev: true
cvss: 10
epss: 0.99907
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2024-45519: Synacor Zimbra Collaboration Suite (ZCS) Command Execution Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Synacor Zimbra Collaboration Suite (ZCS). CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-10-03, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-10-24 ; treat that as the outer limit, not the target.
- EPSS 99.9% , percentile 100.0: FIRST’s model estimates a 99.9% chance of exploitation activity in the next 30 days, higher than 100.0% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

The postjournal service in Zimbra Collaboration (ZCS) before 8.8.15 Patch 46, 9 before 9.0.0 Patch 41, 10 before 10.0.9, and 10.1 before 10.1.1 sometimes allows unauthenticated users to execute commands.

## Affected products (CVE record)

- n/a n/a: see advisory

## Severity

- mitre CVSS 3.1: 10 `CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:C/UI:N`

## Exploitation

- CISA KEV: added 2024-10-03; federal due date 2024-10-24. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 99.91% probability of exploitation activity in the next 30 days; percentile 100.0.

## Sources

- [Listed in CISA KEV notes (wiki.zimbra.com)](https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories)
- [CVE.org record CVE-2024-45519](https://www.cve.org/CVERecord?id=CVE-2024-45519)
- [NVD entry CVE-2024-45519](https://nvd.nist.gov/vuln/detail/CVE-2024-45519)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-45519)
- [wiki.zimbra.com](https://wiki.zimbra.com/wiki/Security_Center)
- [wiki.zimbra.com](https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy)
- [wiki.zimbra.com](https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.1#Security_Fixes)
- [wiki.zimbra.com](https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.9#Security_Fixes)
- [wiki.zimbra.com](https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P41#Security_Fixes)
- [wiki.zimbra.com](https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P46#Security_Fixes)
- [blog.projectdiscovery.io](https://blog.projectdiscovery.io/zimbra-remote-code-execution/)

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Source page: https://erroneo.us/security/cve/CVE-2024-45519/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt