Synacor Zimbra Collaboration Suite (ZCS) Command Injection Vulnerability

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• cpe synacor/zimbra collaboration suite8.8.15
• vendor Synacor Zimbra Collaboration Suite (ZCS)version unspecified

How to fix CVE-2022-27924

• Recommended remediation

  Apply updates per vendor instructions. CISA due date Aug 25, 2022.

• Official advisories

  • CISA KEV · cisa.gov
  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov
  • VulnCheck KEV · vulncheck.com

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Apr 20, 2022 · Catalog

   Detected

   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.

2. Aug 4, 2022 · CISA KEV

   Known exploited

   Apply updates per vendor instructions.

3. Aug 25, 2022 · CISA KEV

   Remediation due

   Apply updates per vendor instructions.

4. Oct 2, 2026 · Catalog

   Updated

   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.

Sources

• CISA KEVConfirmed exploitationCVE-2022-27924

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

  cisa.gov
• CVE.orgVulnerability recordCVE-2022-27924

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2022-27924

  30-day exploitation probability 93.9%

  first.org
• NIST NVDVulnerability recordCVE-2022-27924

  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.

  nvd.nist.gov
• VulnCheck KEVConfirmed exploitationCVE-2022-27924

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

  vulncheck.com

References

• VulnCheck exploitation evidence · assets.sentinelone.com
• VulnCheck exploitation evidence · cisa.gov
• VulnCheck exploitation evidence · cisa.gov
• VulnCheck exploitation evidence · cisa.gov
• CISA note · nvd.nist.gov
• VulnCheck exploitation evidence · unit42.paloaltonetworks.com
• Vendor Advisory · wiki.zimbra.com
• Release Notes · wiki.zimbra.com
• CISA note · wiki.zimbra.com
• Vendor Advisory · wiki.zimbra.com
• US Government Resource · cisa.gov
• VulnCheck exploitation evidence · cisa.gov

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.