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CVE-2022-37042

Synacor Zimbra Collaboration Suite (ZCS) Authentication Bypass

9.8 CRITICALActively exploited (CISA KEV)Used in ransomwarePublic exploitEPSS 91.9%
  1. Published12 Aug 2022
  2. Added to CISA KEV11 Aug 2022
  3. Remediation due1 Sept 2022
Actively exploited (CISA KEV)

Synacor Zimbra Collaboration Suite (ZCS) contains an authentication bypass vulnerability in MailboxImportServlet. This vulnerability was chained with CVE-2022-27925 which allows for unauthenticated remote code execution.

Added to KEV: 11 Aug 2022Federal remediation due: 1 Sept 2022Used in ransomware

Description

Zimbra Collaboration Suite (ZCS) 8.8.15 and 9.0 has mboximport functionality that receives a ZIP archive and extracts files from it. By bypassing authentication (i.e., not having an authtoken), an attacker can upload arbitrary files to the system, leading to directory traversal and remote code execution. NOTE: this issue exists because of an incomplete fix for CVE-2022-27925.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Synacor Zimbra Collaboration Suite8.8.15 · 9.0.0

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2022-37042 being actively exploited?

Yes. CVE-2022-37042 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 11 Aug 2022. It has been used in ransomware campaigns.

How severe is CVE-2022-37042?

CVE-2022-37042 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 91.9% probability of exploitation.

Which products are affected by CVE-2022-37042?

Affected products include Synacor Zimbra Collaboration Suite.

How do I fix CVE-2022-37042?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2022-37042 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.