CVE-2019-9670
Synacor Zimbra Collaboration Suite (ZCS) Improper Restriction of XML External Entity Reference
- Critical 9.8
- Exploited: added to CISA KEV 10 Jan 2022
- A public exploit reference is listed
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.
Key facts
- Published
- 29 May 2019
- Last changed
- 21 Oct 2025
- Assigned by
- mitre
- KEV added
- 10 Jan 2022
- KEV fix due
- 10 Jul 2022
- EPSS
- 99.986% likely to be exploited in the next 30 days, higher than 99.984% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: yes; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 9.8CVSS 3.1, Criticalfrom CISA (ADP container)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
What to do
- Apply updates per vendor instructions.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a |
|
Timeline
- 29 May 2019 Published
- 10 Jan 2022 CVE-2019-9670 added to CISA KEV
- 10 Jan 2022 Added to the CISA KEV catalogue