Is CVE-2020-13965 in the CISA KEV catalog?

Yes. CVE-2020-13965 is on the CISA Known Exploited Vulnerabilities list, added 2024-06-26.

What is the CVSS severity of CVE-2020-13965?

CVE-2020-13965 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2020-13965?

CVE-2020-13965 has an EPSS score of 76.60% (99th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-13965?

Upgrade roundcube on debian 11 to 1.4.5+dfsg.1-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2020-13965

MEDIUMCISA KEVEPSS 99th pctl

6.1

CVSS v3

NVD

Description

An issue was discovered in Roundcube Webmail before 1.3.12 and 1.4.x before 1.4.5. There is XSS via a malicious XML attachment because text/xml is among the allowed types for a preview.

CWE-79Cross-Site Scripting (XSS)CWE-80

How to fix

Remediation Available

roundcubeDebian

Fixed in:1.4.5+dfsg.1-1CVE-2020-13965

roundcubeUbuntu

Fixed in:1.2~beta+dfsg.1-0ubuntu1+esm2USN-5182-1

Fixed in:1.3.6+dfsg.1-1ubuntu0.1~esm2USN-5182-1

Fixed in:1.4.3+dfsg.1-1ubuntu0.1~esm2USN-5182-1

Fixed in:1.5.0+dfsg.1-2ubuntu0.1~esm1USN-5182-1

roundcube-coreUbuntu

Fixed in:1.2~beta+dfsg.1-0ubuntu1+esm2USN-5182-1

Fixed in:1.3.6+dfsg.1-1ubuntu0.1~esm2USN-5182-1

Fixed in:1.4.3+dfsg.1-1ubuntu0.1~esm2USN-5182-1

Fixed in:1.5.0+dfsg.1-2ubuntu0.1~esm1USN-5182-1

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 InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

76.60%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability

Roundcube Webmail contains a cross-site scripting (XSS) vulnerability that allows a remote attacker to manipulate data via a malicious XML attachment.

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Remediation due: 2024-07-17

References

Patch2

Exploit1

github.com

Vendor Advisory1

roundcube.net

Third-Party Advisory1

debian.org

Government Resource1

cisa.gov

Mailing List2

Release Notes2

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	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.