Is CVE-2009-2422 being actively exploited?

CVE-2009-2422 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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

CVE-2009-2422 has a CVSS 3.1 base score of 9.8 (CRITICAL).

CVE-2009-2422

CRITICAL · CVSS 9.8EPSS 3.4%EU EUVD

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.

Key facts

CVSS score: 9.8 (v3.1)
Severity: CRITICAL
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-287
EPSS score: 3.4% (89th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2017-0307)
Published: July 10, 2009
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2017-0307 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.

View on the EU Vulnerability Database

Affected products

apple / mac os x
apple / mac os x
apple / mac os x server
apple / mac os x server
rubyonrails / ruby on rails

Certified products that may be affected

1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.

Apple Mac OS X 10.6 - Apple Inc. - Common Criteria BSI-DSZ-CC-0536-2010 - archived

References

http://lists.apple.com/archives/security-announce/2010//Mar/msg00001.html(Mailing List)
http://n8.tumblr.com/post/117477059/security-hole-found-in-rails-2-3s(Exploit, Patch)
http://secunia.com/advisories/35702(Broken Link, Vendor Advisory)
http://support.apple.com/kb/HT4077(Third Party Advisory)
http://weblog.rubyonrails.org/2009/6/3/security-problem-with-authenticate_with_http_digest(Patch)
http://www.securityfocus.com/bid/35579(Broken Link, Patch, Third Party Advisory, VDB Entry)
http://www.vupen.com/english/advisories/2009/1802(Broken Link, Patch, Vendor Advisory)
https://exchange.xforce.ibmcloud.com/vulnerabilities/51528(Third Party Advisory, VDB Entry)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

Query CVEs from your AI assistant

The CVE/NVD Explorer brain answers CVE questions directly inside Claude, ChatGPT, or any MCP assistant — always up to date, no setup. Add it once and stop pasting advisories into chat.

Add the CVE brain