---
id: CVE-2022-27924
title: >-
  Zimbra Collaboration (aka ZCS) 8.8.15 and 9.0 allows an unauthenticated
  attacker to inject arbitrary memcache commands into a targeted instance
summary: >-
  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.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-74
  - CWE-74
vendor: synacor
product: zimbra_collaboration_suite
affected:
  - zimbra_collaboration_suite = 8.8.15
  - zimbra_collaboration_suite = 9.0.0
published: '2022-04-21'
updated: '2026-08-04'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2022-27924'
references:
  - url: 'https://wiki.zimbra.com/wiki/Security_Center'
    label: cve@mitre.org
  - url: 'https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P24'
    label: cve@mitre.org
  - url: 'https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories'
    label: cve@mitre.org
  - url: 'https://wiki.zimbra.com/wiki/Security_Center'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P24'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-27924
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - kev
  - in-the-wild
  - exploit-available
epss: 0.85398
epssPercentile: 0.99714
kev: true
kevDateAdded: '2022-08-04'
kevDueDate: '2022-08-25'
kevRansomware: true
exploited: true
ingestedAt: '2026-08-04T05:36:12.216Z'
exploits:
  nuclei:
    - CVE-2022-27924
  checkedAt: '2026-09-25T08:20:40.348Z'
exploitAvailable: true
---

## Overview

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.

## Affected

- `zimbra_collaboration_suite = 8.8.15`
- `zimbra_collaboration_suite = 9.0.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.