CVE-2019-9621

Exp

Zimbra Collaboration Suite before 8.6 patch 13, 8.7.x before 8.7.11 patch 10, and 8.8.x before 8.8.10 patch 7 or 8.8.x before 8.8.11 patch 3 allows SSRF via the ProxyServlet component.

Published: 2019-04-30 Last update: 2025-11-04 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-9621 is rated Critical Active Threat (90/100): CVSS High severity, with high exploitation likelihood (EPSS 94.12%, 100th percentile). CISA KEV confirms active exploitation (added 2025-07-07) affecting Synacor / Zimbra Collaboration Suite (ZCS). a weakness (CWE-918) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2019-9621

Name: Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery (SSRF) Vulnerability · CISA KEV detail

Exploit added: 2025-07-07

Action due: 2025-07-28

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Public exploit references (Exploit-DB) for CVE-2019-9621

EDB-ID Source Kind Published Link
46967 exploit_db edb 2019-06-05 Exploit-DB ↗
46693 exploit_db edb 2019-04-12 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2019-9621

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-12-01 94.04% 94.12% +0.08%
2 2025-11-21 91.74% 94.04% +2.30%
3 2025-11-18 — 91.74% —

Full EPSS history (35 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-9621

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2019-9621

Affected software / configurations for CVE-2019-9621

Vendor Product Version Raw CPE
synacor zimbra_collaboration_suite < 8.6.0 cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*
synacor zimbra_collaboration_suite >= 8.7.0, < 8.7.11 cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*
synacor zimbra_collaboration_suite >= 8.8.0, < 8.8.9 cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.6.0 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.6.0:-:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.6.0 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.6.0:patch1:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.6.0 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.6.0:patch10:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.6.0 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.6.0:patch11:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.6.0 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.6.0:patch12:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.6.0 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.6.0:patch2:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.6.0 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.6.0:patch3:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.6.0 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.6.0:patch4:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.6.0 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.6.0:patch5:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.6.0 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.6.0:patch6:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.6.0 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.6.0:patch7:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.6.0 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.6.0:patch8:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.6.0 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.6.0:patch9:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.7.11 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:-:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.7.11 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:patch1:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.7.11 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:patch10:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.7.11 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:patch2:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.7.11 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:patch3:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.7.11 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:patch4:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.7.11 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:patch5:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.7.11 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:patch6:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.7.11 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:patch7:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.7.11 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:patch8:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.7.11 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:patch9:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.8.9 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.9:-:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.8.9 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.9:p5:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.8.9 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.9:patch1:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.8.9 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.9:patch2:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.8.9 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.9:patch3:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.8.9 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.9:patch4:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.8.9 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.9:patch6:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.8.9 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.9:patch7:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.8.9 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.9:patch8:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.8.9 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.9:patch9:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.8.10 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.10:-:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.8.10 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.10:patch1:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.8.10 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.10:patch2:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.8.10 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.10:patch3:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.8.10 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.10:patch4:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.8.10 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.10:patch6:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.8.10 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.10:patch7:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.8.11 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.11:-:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.8.11 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.11:patch1:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.8.11 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.11:patch2:*:*:*:*:*:*
synacor zimbra_collaboration_suite 8.8.11 cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.11:patch3:*:*:*:*:*:*

References for CVE-2019-9621

URL Tags
http://packetstormsecurity.com/files/152487/Zimbra-Collaboration-Autodiscover-Servlet-XXE-ProxyServlet-SSRF.html Exploit Third Party Advisory VDB Entry
http://packetstormsecurity.com/files/153190/Zimbra-XML-Injection-Server-Side-Request-Forgery.html Exploit Third Party Advisory VDB Entry
http://www.rapid7.com/db/modules/exploit/linux/http/zimbra_xxe_rce Exploit Third Party Advisory
https://blog.tint0.com/2019/03/a-saga-of-code-executions-on-zimbra.html Third Party Advisory
https://blog.zimbra.com/2019/03/9826/ Vendor Advisory
https://bugzilla.zimbra.com/show_bug.cgi?id=109127 Issue Tracking
https://wiki.zimbra.com/wiki/Security_Center Release Notes Vendor Advisory
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories Vendor Advisory
https://www.exploit-db.com/exploits/46693/ Exploit Third Party Advisory VDB Entry
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-9621 US Government Resource
cvelogic Threat Intelligence