Is CVE-2011-5036 in the CISA KEV catalog?

No. CVE-2011-5036 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-5036?

CVE-2011-5036 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2011-5036?

CVE-2011-5036 has an EPSS score of 4.02% (89th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2011-5036?

Upgrade ruby-rack on debian 11 to 1.4.0-1 or later.

CVE & CISA-KEV Catalog

CVE-2011-5036

MEDIUMEPSS 89th pctl

5.0

CVSS v2

NVD

Description

Rack before 1.1.3, 1.2.x before 1.2.5, and 1.3.x before 1.3.6 computes hash values for form parameters without restricting the ability to trigger hash collisions predictably, which allows remote attackers to cause a denial of service (CPU consumption) by sending many crafted parameters.

CWE-310Cryptographic Issues

How to fix

Remediation Available

ruby-rackDebian

Fixed in:1.4.0-1CVE-2011-5036

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

4.02%probability of exploitation in 30 days

89thpercentile

Elevated risk: more likely to be exploited than 89% of all known CVEs.

References

Exploit1

gist.github.com

Government Resource1

kb.cert.org

Other references4

Related Vulnerabilities

Other CWE-310 (Cryptographic Issues) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-3566	Low	3.4	100%	-	Fix
CVE-2015-4000	Low	3.7	100%	-	Fix
CVE-2015-0204	Medium	4.3	99%	-	Fix
CVE-2016-2107	Medium	5.9	89%	-	Fix
CVE-2016-0800	Medium	5.9	82%	-	Fix
CVE-2014-8684	Critical	9.8	72%	-	-

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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 2026-04-29.