CVE-2020-8633

Q: How do I fix CVE-2020-8633?

Upgrade zimbra collaboration suite to 8.8.15 or later.

Q: Is CVE-2020-8633 being actively exploited?

Not that we know of. CVE-2020-8633 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.1% is the estimated probability that it will be exploited in the next 30 days. That is higher than 62% of all scored CVEs.

Q: How severe is CVE-2020-8633?

CVE-2020-8633 has a CVSS v3 base score of 5.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2020-8633 affect?

Published advisories record a fix for zimbra collaboration suite (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

MEDIUM

5.3

CVSS v3

NVD

Description

An issue was discovered in Zimbra Collaboration Suite (ZCS) before 8.8.15 Patch 7. When grantors revoked a shared calendar in Outlook, the calendar stayed mounted and accessible.

CWE-281

How to fix

Remediation Available

zimbra collaboration suiteNVD

Affected:< 8.8.15Fixed in:8.8.15CVE-2020-8633derived 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

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

1.07%probability of exploitation in 30 days

62ndpercentile

Moderate risk: more likely to be exploited than 62% of all known CVEs.

References

Vendor Advisory1

wiki.zimbra.com

Related Vulnerabilities

Other CWE-281 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-8543	Critical	9.8	74%	KEV	-
CVE-2019-0233	High	7.5	68%	-	-
CVE-2017-8589	Critical	9.8	24%	-	-
CVE-2021-33990	Critical	9.8	12%	-	-
CVE-2017-8578	High	7.8	6.3%	-	-
CVE-2017-8563	High	8.1	5.9%	-	-

Common questions

How do I fix CVE-2020-8633?

Upgrade zimbra collaboration suite to 8.8.15 or later.

Is CVE-2020-8633 being actively exploited?

Not that we know of. CVE-2020-8633 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.1% is the estimated probability that it will be exploited in the next 30 days. That is higher than 62% of all scored CVEs.

How severe is CVE-2020-8633?

CVE-2020-8633 has a CVSS v3 base score of 5.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2020-8633 affect?

Published advisories record a fix for zimbra collaboration suite (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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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.