What is CVE-2024-45519?

CVE-2024-45519 is a critical-severity vulnerability in Synacor Zimbra Collaboration Suite, classified under OS Command Injection. CVSS score: 10.0/10. Published 2024-10-02.

How severe is CVE-2024-45519?

Critical severity. CVSS v3 base score is 10.0 out of 10.

Is CVE-2024-45519 known to be exploited?

Yes. CVE-2024-45519 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-10-03), indicating it is being actively exploited. 33 public proof-of-concept repositories are indexed.

RCE in Synacor Zimbra Collaboration Suite

CVE-2024-45519

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.

Vulnerability class: Command Injection (OS Command Injection)

Published 2024-10-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.999 (100.0th percentile), scored 2026-10-11.

Very high probability of exploitation in the next 30 days — among the top 0.1% most-likely-to-be-exploited CVEs. 100th percentile — 100.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.999 · newest: 0.999 · change: 0.000

Affected products

Synacor Zimbra Collaboration Suite — versions 8.8.15, 9.0.0, 10.1.0

Weakness classification (CWE)

CWE-78 — OS Command Injection

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2024-10-03. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2024-10-24.

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

Public proof-of-concept exploits

References

wiki.zimbra.com/wiki/Security_Center (Release Notes)
wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy (Not Applicable)
wiki.zimbra.com/wiki/Zimbra_Releases/10.1.1 (Release Notes)
wiki.zimbra.com/wiki/Zimbra_Releases/10.0.9 (Release Notes)
wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P41 (Release Notes)
wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P46 (Release Notes)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (Exploit)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2024-45519?: CVE-2024-45519 is a critical-severity vulnerability in Synacor Zimbra Collaboration Suite, classified under OS Command Injection. CVSS score: 10.0/10. Published 2024-10-02.
How severe is CVE-2024-45519?: Critical severity. CVSS v3 base score is 10.0 out of 10.
Is CVE-2024-45519 known to be exploited?: Yes. CVE-2024-45519 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-10-03), indicating it is being actively exploited. 33 public proof-of-concept repositories are indexed.