CVE catalog

CVE-2021-22903

rails: CVE-2021-22903

Severity: Low
Published: May 5, 2021, 10:00:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 1.23% · Oct 22, 2026

The actionpack ruby gem before 6.1.3.2 suffers from a possible 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. This is similar to CVE-2021-22881. Strings in config.hosts that do not have a leading dot are converted to regular expressions without proper escaping. This causes, for example, `config.hosts << "sub.example.com"` to permit a request with a Host header value of `sub-example.com`.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	rails	sid	`2:7.2.4+dfsg-2`	not affected
Debian	rails	forky	`2:7.2.4+dfsg-1`	not affected
Debian	rails	trixie	`2:7.2.2.2+dfsg-2~deb13u1`	not affected
Debian	rails	trixie-security	`2:7.2.2.2+dfsg-2~deb13u2`	not affected
Debian	rails	bookworm	`2:6.1.7.10+dfsg-1~deb12u2`	not affected
Debian	rails	bookworm-security	`2:6.1.7.10+dfsg-1~deb12u3`	not affected

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	rails	source	sid	`Not affected`	unimportant	Not reported	Not reported
Debian	rails	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	rails	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	rails	source	bookworm	`Not affected`	unimportant	Not reported	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[rails]Not affected
Details (4)
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
[ruby-actioncable]Not affected
Source package: [rails]
Details (4)
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
[ruby-actionmailbox]Not affected
Source package: [rails]
Details (4)
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
[ruby-actionmailer]Not affected
Source package: [rails]
Details (4)
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
[ruby-actionpack]Not affected
Source package: [rails]
Details (4)
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
[ruby-actiontext]Not affected
Source package: [rails]
Details (4)
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
[ruby-actionview]Not affected
Source package: [rails]
Details (4)
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
[ruby-activejob]Not affected
Source package: [rails]
Details (4)
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
[ruby-activemodel]Not affected
Source package: [rails]
Details (4)
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
[ruby-activerecord]Not affected
Source package: [rails]
Details (4)
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
[ruby-activestorage]Not affected
Source package: [rails]
Details (4)
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
[ruby-activesupport]Not affected
Source package: [rails]
Details (4)
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
[ruby-rails]Not affected
Source package: [rails]
Details (4)
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
[ruby-railties]Not affected
Source package: [rails]
Details (4)
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm
- 2:6.1.7.10+dfsg-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · rails · debian · bookworm

Observed: Oct 23, 2026, 5:54:51 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS]