Is CVE-2021-35209 in the CISA KEV catalog?

No. CVE-2021-35209 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-35209?

CVE-2021-35209 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2021-35209?

CVE-2021-35209 has an EPSS score of 2.97% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-35209?

Upgrade collaboration to 8.8.15 or later.

CVE & CISA-KEV Catalog

CVE-2021-35209

CRITICALEPSS 86th pctl

9.8

CVSS v3

NVD

Description

An issue was discovered in ProxyServlet.java in the /proxy servlet in Zimbra Collaboration Suite 8.8 before 8.8.15 Patch 23 and 9.x before 9.0.0 Patch 16. The value of the X-Host header overwrites the value of the Host header in proxied requests. The value of X-Host header is not checked against the whitelist of hosts Zimbra is allowed to proxy to (the zimbraProxyAllowedDomains setting).

CWE-918Server-Side Request Forgery (SSRF)

How to fix

Remediation Available

collaborationNVD

Affected:>= 8.8, < 8.8.15Fixed in:8.8.15CVE-2021-35209derived from NVD

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

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

2.97%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Exploit1

blog.sonarsource.com

Vendor Advisory4

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 2024-11-21.