Is CVE-2018-16471 in the CISA KEV catalog?

No. CVE-2018-16471 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-16471?

CVE-2018-16471 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2018-16471?

CVE-2018-16471 has an EPSS score of 1.82% (76th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-16471?

Upgrade ruby-rack on debian 11 to 1.6.4-6 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2018-16471

MEDIUMEPSS 76th pctl

6.1

CVSS v3

NVD

Description

There is a possible XSS vulnerability in Rack before 2.0.6 and 1.6.11. Carefully crafted requests can impact the data returned by the `scheme` method on `Rack::Request`. Applications that expect the scheme to be limited to 'http' or 'https' and do not escape the return value could be vulnerable to an XSS attack. Note that applications using the normal escaping mechanisms provided by Rails may not impacted, but applications that bypass the escaping mechanisms, or do not use them may be vulnerable.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

ruby-rackDebian

Fixed in:1.6.4-6CVE-2018-16471

ruby-rackUbuntu

Fixed in:1.6.4-3ubuntu0.1USN-4089-1

Fixed in:1.6.4-4ubuntu0.1USN-4089-1

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 InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploit Intelligence

1.82%probability of exploitation in 30 days

76thpercentile

Elevated risk: more likely to be exploited than 76% of all known CVEs.

References

Third-Party Advisory1

lists.debian.org

Other references4

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 2024-11-21.