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CVE-2022-27924

7.5
HIGHCVSS v3.1 Base Score
90.44%
HIGH RiskEPSS (100th percentile)
KEV

Zimbra Collaboration (aka ZCS) 8.8.15 and 9.0 allows an unauthenticated attacker to inject arbitrary memcache commands into a targeted instance. These memcache commands becomes unescaped, causing an overwrite of arbitrary cached entries.

Published: 4/21/2022
Modified: 10/31/2025
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ACTIVELY EXPLOITED IN THE WILD

This vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability Name:

Synacor Zimbra Collaboration Suite (ZCS) Command Injection Vulnerability

Vendor / Product:

Synacor Zimbra Collaboration Suite (ZCS)

Required Action:

Apply updates per vendor instructions.

Due Date: 8/25/2022(OVERDUE)
Ransomware Campaign Use
Added to KEV:

8/4/2022

Notes:

https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P24.1#Security_Fixes; https://nvd.nist.gov/vuln/detail/CVE-2022-27924

Vulnerability Summary

CVSS v3 Score

7.5HIGH

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

CVSS v2 Score

5

AV:N/AC:L/Au:N/C:N/I:P/A:N

EPSS Score (Exploitation Probability)

90.44%HIGH Exploitation Risk
100th percentile

This vulnerability has a 90.44% probability of being exploited in the next 30 days, ranking higher than 100% of all scored CVEs.

CWE Classification

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Similar SeverityHIGH