Is CVE-2020-13935 in the CISA KEV catalog?

No. CVE-2020-13935 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-13935?

CVE-2020-13935 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2020-13935?

CVE-2020-13935 has an EPSS score of 87.55% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-13935?

Upgrade tomcat9 on debian 11 to 9.0.37-1 or later. Fixes are available for 7 affected products.

CVE & CISA-KEV Catalog

CVE-2020-13935

HIGHEPSS 100th pctl

7.5

CVSS v3

NVD

Description

The payload length in a WebSocket frame was not correctly validated in Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M1 to 9.0.36, 8.5.0 to 8.5.56 and 7.0.27 to 7.0.104. Invalid payload lengths could trigger an infinite loop. Multiple requests with invalid payload lengths could lead to a denial of service.

CWE-835

How to fix

Remediation Available

tomcat9Debian

Fixed in:9.0.37-1CVE-2020-13935

libtomcat8-javaUbuntu

Fixed in:8.0.32-1ubuntu1.13USN-4448-1

libtomcat9-embed-javaUbuntu

Fixed in:9.0.31-1ubuntu0.1USN-4596-1

libtomcat9-javaUbuntu

Fixed in:9.0.31-1ubuntu0.1USN-4596-1

tomcat8Ubuntu

Fixed in:8.0.32-1ubuntu1.13USN-4448-1

tomcat9Ubuntu

Fixed in:9.0.31-1ubuntu0.1USN-4596-1

tomcat9-commonUbuntu

Fixed in:9.0.31-1ubuntu0.1USN-4596-1

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 InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

87.55%probability of exploitation in 30 days

100thpercentile

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

References

Patch6

Vendor Advisory1

lists.apache.org

Third-Party Advisory9

Other references1

lists.apache.org

Related Vulnerabilities

Other CWE-835 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-36227	High	7.5	78%	-	Fix
CVE-2024-20353	High	8.6	71%	KEV	-
CVE-2022-0778	High	7.5	71%	-	Fix
CVE-2019-14241	High	7.5	70%	-	-
CVE-2017-16944	High	7.5	63%	-	Fix
CVE-2023-34966	High	7.5	60%	-	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.