No exploitation reportedFix available

CVE-2009-2422

Q: Is CVE-2009-2422 actively exploited?

Active exploitation of CVE-2009-2422 has not been confirmed. Its EPSS score was 3.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2009-2422?

CVE-2009-2422 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2009-07-10
Fixed in10.6.3
WeaknessCWE-287

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The example code for the digest authentication functionality (http_authentication.rb) in Ruby on Rails before 2.3.3 defines an authenticate_or_request_with_http_digest block that returns nil instead of false when the user does not exist, which allows context-dependent attackers to bypass authentication for applications that are derived from this example by sending an invalid username without a password.

Timeline

dates in UTC

2009-07-1015:30CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2009-2422?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2009-2422?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Apple mac os x

Branch	Affected	Fixed in	Source
10.6	≥ 10.6.0, < 10.6.3	10.6.3	NVD
10.5	= 10.5.8	no fix published	NVD

Apple mac os x server

Branch	Affected	Fixed in	Source
10.6	≥ 10.6.0, < 10.6.3	10.6.3	NVD
10.5	= 10.5.8	no fix published	NVD

Rubyonrails ruby on rails

Branch	Affected	Fixed in	Source
2.3	< 2.3.3	2.3.3	NVD · OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Apple mac os x to 10.6.3

Advisories and patches

n8.tumblr.comPatch
secunia.comVendor Advisory
weblog.rubyonrails.orgPatch
www.securityfocus.comPatch
www.vupen.comPatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
NVDweakness (CWE)CWE-287read 2026-10-23
FIRST EPSSEPSS score3.4 %2026-10-22
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2009-07-10
Last Modified: 2026-06-16
NVD status: Modified

Frequently asked questions

What is CVE-2009-2422?

Is CVE-2009-2422 actively exploited?

Active exploitation of CVE-2009-2422 has not been confirmed. Its EPSS score was 3.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2009-2422?

CVE-2009-2422 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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