CVE-2021-22881

MEDIUM NUCLEI

Action Pack <6.1.2.1, 6.0.3.5 - Open Redirect

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2021-22881 has a Nuclei detection template available — see the Nuclei card below for the Shodan/FOFA recon queries.

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.

Nuclei Templates (1)

Ruby on Rails - Open Redirect via Host Header Injection
MEDIUMby theamanrawat

References (7)

Core 7
Core References
Exploit, Patch, Third Party Advisory x_refsource_misc
https://hackerone.com/reports/1047447
Mailing List, Mitigation, Third Party Advisory mailing-list x_refsource_mlist
http://www.openwall.com/lists/oss-security/2021/05/05/2
Mailing List, Mitigation, Third Party Advisory mailing-list x_refsource_mlist
http://www.openwall.com/lists/oss-security/2021/08/20/1
Exploit, Mailing List, Patch mailing-list x_refsource_mlist
http://www.openwall.com/lists/oss-security/2021/12/14/5

Scores

CVSS v3 6.1
EPSS 0.8724
EPSS Percentile 99.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Details

CWE
CWE-601
Status published
Products (3)
fedoraproject/fedora 33
rubygems/actionpack 6.0.0 - 6.0.3.5RubyGems
rubyonrails/rails 6.0.0 - 6.0.3.5
Published Feb 11, 2021
Tracked Since Feb 18, 2026