Critical 9.8Known exploited (CISA KEV)Published Apr 20, 2022

CVE-2022-27924Zimbra Collaboration (aka ZCS) 8.8.15 and 9.0 allows an unauthenticated attacker to inject arbitrary memcache commands into a targeted instance.

Updated under an hour ago (2026-10-19 07:23 UTC)

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It affects synacor zimbra_collaboration_suite. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Aug 4, 2022; federal agencies had to remediate by Aug 25, 2022, and it is known to be used in ransomware. Treat that date as your deadline.

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Every CVE for synacor zimbra_collaboration_suite

Exploited in the last 30 days

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.

CVSS: 9.8 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-74
Known exploited: Added to CISA KEV Aug 4, 2022; federal remediation due Aug 25, 2022; known ransomware useApply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 93.91% (percentile 100)
Assigned by: mitre
NVD analysis: Analyzed
Record last updated: Oct 1, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

synacor zimbra_collaboration_suite synacor:zimbra_collaboration_suite	8.8.15; 8.8.15; 8.8.15; 8.8.15; 8.8.15; 8.8.15; 8.8.15; 8.8.15; and 48 more ranges	NVD

References

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisoriesx-refsource-misc, vendor-advisory
https://wiki.zimbra.com/wiki/Security_Centerx-refsource-misc, vendor-advisory
https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P24x-refsource-misc, release-notes, vendor-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-27924us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.