Is CVE-2019-9621 in the CISA KEV catalog?

Yes. CVE-2019-9621 is on the CISA Known Exploited Vulnerabilities list, added 2025-07-07.

What is the CVSS severity of CVE-2019-9621?

CVE-2019-9621 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2019-9621?

CVE-2019-9621 has an EPSS score of 80.91% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-9621?

Upgrade zimbra collaboration suite to 8.8.9 or later.

CVE & CISA-KEV Catalog

CVE-2019-9621

HIGHCISA KEVEPSS 100th pctl

7.5

CVSS v3

NVD

Description

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.

CWE-918Server-Side Request Forgery (SSRF)

How to fix

Remediation Available

zimbra collaboration suiteNVD

Affected:>= 8.8.0, < 8.8.9Fixed in:8.8.9CVE-2019-9621derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploit Intelligence

80.91%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery (SSRF) Vulnerability

Synacor Zimbra Collaboration Suite (ZCS) contains a server-side request forgery (SSRF) vulnerability via the ProxyServlet component.

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

Remediation due: 2025-07-28

References

Exploit4

Vendor Advisory3

Third-Party Advisory1

blog.tint0.com

Government Resource1

cisa.gov

Issue Tracking1

bugzilla.zimbra.com

Related Vulnerabilities

Other CWE-918 (Server-Side Request Forgery (SSRF)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-21893	High	8.2	100%	KEV + Ransom	-
CVE-2021-40438	Critical	9.0	100%	KEV	Fix
CVE-2021-34473	Critical	9.1	100%	KEV + Ransom	Fix
CVE-2021-26855	Critical	9.1	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-41040	High	8.8	100%	KEV + Ransom	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-04.