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CVE-2019-9670

Synacor Zimbra Collaboration Suite (ZCS) Improper Restriction of XML External Entity Reference

9.8 CRITICALActively exploited (CISA KEV)Public exploitEPSS 100.0%
  1. Published29 May 2019
  2. Added to CISA KEV10 Jan 2022
  3. Remediation due10 Jul 2022
Actively exploited (CISA KEV)

Synacor Zimbra Collaboration Suite (ZCS) contains an improper restriction of XML external entity (XXE) vulnerability in the mailboxd component.

Added to KEV: 10 Jan 2022Federal remediation due: 10 Jul 2022

Description

mailboxd component in Synacor Zimbra Collaboration Suite 8.7.x before 8.7.11p10 has an XML External Entity injection (XXE) vulnerability, as demonstrated by Autodiscover/Autodiscover.xml.

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 Suite≥ 8.7.0 < 8.7.11 · 8.7.11

Remediation

Fixed in
Synacor Zimbra Collaboration Suite≥ 8.7.11

References

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Frequently asked

Is CVE-2019-9670 being actively exploited?

Yes. CVE-2019-9670 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 10 Jan 2022.

How severe is CVE-2019-9670?

CVE-2019-9670 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 100.0% probability of exploitation.

Which products are affected by CVE-2019-9670?

Affected products include Synacor Zimbra Collaboration Suite.

How do I fix CVE-2019-9670?

Upgrade affected software to a fixed version, for example Synacor Zimbra Collaboration Suite 8.7.11 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2019-9670 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.