AUGUST 5, 2026
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Case File

CVE-2021-22881

MEDIUM · CVSS 6.1 EPSS 87.30%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-02-11 · Last synced 2026-08-04

CyberRota Analysis

This is a medium severity vulnerability with a CVSS score of 6.1. Its EPSS score suggests a 87.3% probability of exploitation in the next 30 days.

CVE
CVE-2021-22881
Severity
MEDIUM
CVSS
6.1
EPSS
87.30%

Original 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.

Related CVEs

Other vulnerabilities affecting the same vendor(s)