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CVE-2024-45519

98
FAUCET Score

CVE-2024-45519 is a critical remote code execution vulnerability affecting the postjournal service in Zimbra Collaboration Suite (ZCS) versions before 8.8.15 Patch 46, 9 before Patch 41, 10 before 10.0.9, and 10.1 before 10.1.1. This flaw allows unauthenticated attackers to execute arbitrary commands on vulnerable servers. With a CVSS score of 9.8 (Critical), it presents a severe risk due to its network-based attack vector, low attack complexity, and complete compromise of confidentiality, integrity, and availability. The vulnerability is actively exploited in the wild, as confirmed by its presence in the KEV catalog, and has garnered significant community discussion and media coverage, including reports of servers being backdoored via email.

Impacted Technologies

VendorProductVersion(s)CPE
< 8.8.15CPE matchmatch criteria
cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*
>= 10.0.0, < 10.0.9CPE matchmatch criteria
cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*
8.8.15CPE matchmatch criteria
cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:-:*:*:*:*:*:*
8.8.15CPE matchmatch criteria
cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p1:*:*:*:*:*:*
8.8.15CPE matchmatch criteria
cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p10:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

10.0CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
99.88%
Probability of exploitation in next 30 days
EPSS Percentile
100.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
Added to KEV · Oct 3, 2024
Nuclei: CVE-2024-45519 · Sep 28, 2024
This CVE's current EPSS score of 0.9988 is in the 100th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

blog.projectdiscovery.io / zimbra-remote-code-execution
Exploit
cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
wiki.zimbra.com / wiki/Security_Center
Release Notes
wiki.zimbra.com / wiki/Zimbra_Releases/10.0.9
Release Notes
wiki.zimbra.com / wiki/Zimbra_Releases/10.1.1
Release Notes
wiki.zimbra.com / wiki/Zimbra_Releases/8.8.15/P46
Release Notes
wiki.zimbra.com / wiki/Zimbra_Releases/9.0.0/P41
Release Notes
wiki.zimbra.com / wiki/Zimbra_Responsible_Disclosure_Policy
Not Applicable