Is CVE-2017-6056 in the CISA KEV catalog?

No. CVE-2017-6056 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-6056?

CVE-2017-6056 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2017-6056?

CVE-2017-6056 has an EPSS score of 7.49% (94th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-6056?

Upgrade libtomcat7-java on ubuntu 14.04 to 7.0.52-1ubuntu0.10 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2017-6056

HIGHEPSS 94th pctl

7.5

CVSS v3

NVD

Description

It was discovered that a programming error in the processing of HTTPS requests in the Apache Tomcat servlet and JSP engine may result in denial of service via an infinite loop. The denial of service is easily achievable as a consequence of backporting a CVE-2016-6816 fix but not backporting the fix for Tomcat bug 57544. Distributions affected by this backporting issue include Debian (before 7.0.56-3+deb8u8 and 8.0.14-1+deb8u7 in jessie) and Ubuntu.

CWE-835

How to fix

Remediation Available

libtomcat7-javaUbuntu

Fixed in:7.0.52-1ubuntu0.10USN-3204-1

tomcat7Ubuntu

Fixed in:7.0.52-1ubuntu0.10USN-3204-1

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

Exploit Intelligence

7.49%probability of exploitation in 30 days

94thpercentile

High risk: more likely to be exploited than 94% of all known CVEs.

References

Third-Party Advisory14

Other references3

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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 2026-05-13.