CVE-2022-27924Synacor Zimbra Collaboration Suite (ZCS) Command Injection Vulnerability

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.

9.8 CRITICALEPSS 93.90%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-10-02 14:55 UTC

OverviewCVSS details

9.8CRITICALCVSS 3.1

Score source: CISA-ADP
NVD status: Analyzed
Published: Apr 21, 2022
Assigner: mitre

Affected

zimbra collaboration suite (synacor)

Versions: 8.8.15 · 8.8.15 p1

All affected versions →

Exploitation

Public exploit: None listed
CISA KEV: Listed · Aug 4, 2022
KEV due date: Aug 25, 2022
Ransomware use: Known
SSVC: Exploitation active · Automatable yes · Impact total

EPSS · FIRST, scored Nov 7

93.90%chance of exploitation in 30 days

Higher than 99.84% of CVEs

CVSS 3.1 · CISA-ADP

9.8Critical

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

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

CVSS 3.1 · NVD

7.5High

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

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: High
Availability impact: None

CVSS 2.0 · NVD

5.0Medium

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

Attack vector: Network
Attack complexity: Low
Authentication: None
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
9.8	CRITICAL	3.1CISA-ADP	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5	HIGH	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
5.0	MEDIUM	2.0NVD	AV:N/AC:L/Au:N/C:N/I:P/A:N

CISA required action

⚡ Known exploited · remediation due Aug 25, 2022

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Details

CVE ID: CVE-2022-27924
Status: Analyzed
Assigner (CNA): mitre
Published: Apr 21, 2022
Last modified: 2026-10-02 14:55 UTC
Weaknesses: CWE-74
CWE-93

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 14:26 UTC.