CVE-2022-27924

Zimbra Collaboration (aka ZCS) 8.8.15 and 9.0 allows an unauthenticated attacker to inject...

7.5 HighIn 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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: High
Availability: None

Exploit likelihood

93.9%Up 93.0 points since Apr 21, 2022

What each source reports

NVD Score used 7.5

Record: CVE-2022-27924
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:P/A:N
Weakness: CWE-74
Updated: 2026-11-02

CVE List 9.8

Record: CVE-2022-27924
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-74
Updated: 2026-11-02

EUVDEUVD-2022-32412 9.8

Record: EUVD-2022-32412
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-763p-5rx7-r4qf 7.5

Zimbra Collaboration (aka ZCS) 8.8.15 and 9.0 allows an unauthenticated attacker to inject...

Record: GHSA-763p-5rx7-r4qf
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness: CWE-74, CWE-77
Updated: 2026-11-02

CISA KEV No score

Synacor Zimbra Collaboration Suite (ZCS) Command Injection Vulnerability

Synacor Zimbra Collaboration Suite (ZCS) allows an attacker to inject memcache commands into a targeted instance which causes an overwrite of arbitrary cached entries.

Record: CVE-2022-27924
Weakness: CWE-93
Updated: 2026-11-02

OSV 9.8

Record: CVE-2022-27924
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
Nuclei	Zimbra Collaboration Suite - Memcached Command Injection

History

History
Recorded	Changed	Sources
Nov 3, 2026	exploitation
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, CISA KEV, Nuclei, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2022-27924 is a high vulnerability (CVSS 7.5) in Synacor Zimbra Collaboration Suite (zcs), published April 20, 2022. CISA lists it as known to be exploited, since August 4, 2022. EUVD reports exploitation since August 4, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 93.9%, the 99th percentile. No source names a fixed version.