Is CVE-2021-22881 in the CISA KEV catalog?

No. CVE-2021-22881 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-22881?

CVE-2021-22881 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2021-22881?

CVE-2021-22881 has an EPSS score of 87.30% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-22881?

Upgrade rails on debian 11 to 2:6.0.3.5+dfsg-1 or later.

CVE & CISA-KEV Catalog

CVE-2021-22881

MEDIUMEPSS 100th pctl

6.1

CVSS v3

NVD

Description

The Host Authorization middleware in Action Pack before 6.1.2.1, 6.0.3.5 suffers from an open redirect vulnerability. Specially crafted `Host` headers in combination with certain "allowed host" formats can cause the Host Authorization middleware in Action Pack to redirect users to a malicious website. Impacted applications will have allowed hosts with a leading dot. When an allowed host contains a leading dot, a specially crafted `Host` header can be used to redirect to a malicious website.

CWE-601Open Redirect

How to fix

Remediation Available

railsDebian

Fixed in:2:6.0.3.5+dfsg-1CVE-2021-22881

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

87.30%probability of exploitation in 30 days

100thpercentile

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

References

Patch4

Mitigation2

Other references1

lists.fedoraproject.org

Related Vulnerabilities

Other CWE-601 (Open Redirect) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-4123	High	7.6	98%	-	Fix
CVE-2018-11784	Medium	4.3	94%	-	Fix
CVE-2022-45402	Medium	6.1	82%	-	Fix
CVE-2017-1000117	High	8.8	78%	-	Fix
CVE-2019-10098	Medium	6.1	74%	-	Fix
CVE-2020-8143	Medium	6.1	70%	-	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.