CVE-2021-22881

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

87.30% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 99.7% of scored records. A rank, not a probability.

NVD base score

6.1 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-02-11 16:12Z5 YR AGO

Last updated

2024-08-03 18:58Z2 YR AGO

Reserved

2021-01-06

Assigning CNA

hackerone

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-601URL Redirection to Untrusted Site ('Open Redirect')Base

Data version

5.1

Document digest

fe762fd8d1d87a798af65052635b588a48c6554a389c753b7a367cc75cab7296

• hackerone.comhttps://hackerone.com/reports/1047447x_refsource_MISC
• discuss.rubyonrails.orghttps://discuss.rubyonrails.org/t/cve-2021-22881-possible-open-redirect-in-host-authorization-middleware/77130x_refsource_MISC
• benjamin-bouchet.comhttps://benjamin-bouchet.com/cve-2021-22881-faille-de-securite-dans-le-middleware-hostauthorization/x_refsource_MISC
• lists.fedoraproject.orgFEDORA-2021-b571fca1b8https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XQ3NS4IBYE2I3MVMGAHFZBZBIZGHXHT3/vendor-advisoryx_refsource_FEDORA
• www.openwall.com[oss-security] 20210505 [CVE-2021-22903] Possible Open Redirect Vulnerability in Action Packhttp://www.openwall.com/lists/oss-security/2021/05/05/2mailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20210819 [CVE-2021-22942] Possible Open Redirect in Host Authorization Middlewarehttp://www.openwall.com/lists/oss-security/2021/08/20/1mailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20211214 [CVE-2021-44528] Possible Open Redirect in Host Authorization Middlewarehttp://www.openwall.com/lists/oss-security/2021/12/14/5mailing-listx_refsource_MLIST