Exploited CVEs / Synacor / CVE-2024-45519
CVE-2024-45519
Synacor Zimbra Collaboration Suite (ZCS) Command Execution Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2024-10-24 (that deadline has passed); treat that date as the outer bound for your own environment. The fix is in the vendor advisory: Zimbra Security Center, linked below.
Actively exploited Synacor Zimbra Collaboration Suite (ZCS) vulnerability, Critical severity, CVSS 9.8. Added to the CISA KEV catalog 2024-10-03.
Risk summary
Updated July 30, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2024-45519
Zimbra's postjournal service can be made to execute commands by an unauthenticated sender, and exploitation began with attackers simply emailing malicious SMTP traffic to vulnerable servers. The EPSS score is a maximum 100%, the Severity rating is Critical at CVSS 9.8, and CISA confirmed attacks on 2024-10-03. Zimbra servers are disproportionately run by governments, universities, and SMBs, populations that patch slowly and hold valuable mail.
Do this: Patch Zimbra now, or disable the postjournal service if you cannot, and inspect the server for web shells.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2024-45519
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2024-45519
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
CISA required action
Federal (BOD 22-01) remediation due date: 2024-10-24 (past due).
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Official fix for CVE-2024-45519
The authoritative fix and affected-version list are published by the vendor. Find the Zimbra Collaboration Suite (ZCS) advisory on Zimbra Security Center.
Common questions about CVE-2024-45519
Is CVE-2024-45519 actively exploited?
Yes. CVE-2024-45519 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2024-10-03, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 100%.
What is the CISA deadline and required action for CVE-2024-45519?
CISA set the federal (BOD 22-01) remediation due date at 2024-10-24, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
What fixes CVE-2024-45519?
The authoritative fix is in the vendor advisory: see Zimbra Security Center for the patched Zimbra Collaboration Suite (ZCS) versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2024-45519?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2024-45519's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (5 AM and 3 PM US Central).
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Authoritative references
Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.
