CVE-2009-2422

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 3.4% (88th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3.4%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
50
EG Risk 50/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation3% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
3.4%
EPSS %ILE
88th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 10, 2009

Last Modified

April 23, 2026

Advisory Details (5)

Auto-updated Oct 8, 2026
Patch available.
generic

IBM X-Force Exchange

https://exchange.xforce.ibmcloud.com/vulnerabilities/51528
generic

VUPEN Security - Vulnerability Research and Intelligence

http://www.vupen.com/english/advisories/2009/1802
generic

CVE-2009-2422 - PSIRT.COM

http://www.securityfocus.com/bid/35579
generic

Secunia Research & Vulnerability Insights | Flexera

http://secunia.com/advisories/35702
generic

Nate's Tumble Log : Security hole found in Rails 2.3's...

http://n8.tumblr.com/post/117477059/security-hole-found-in-rails-2-3s

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
rails—
  • every version up to 2.3.5-1: fixed in 2.3.5-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
rails—
  • every version up to 2.3.5-1: fixed in 2.3.5-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
rails—
  • every version up to 2.3.5-1: fixed in 2.3.5-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
rails—
  • every version up to 2.3.5-1: fixed in 2.3.5-1
—
RubyGems(1)
PackageVulnerable rangeFix by version rangeDependents
rails0.10.0 ... 2.3.2 (47 versions)
  • every version up to 2.3.3: fixed in 2.3.3
—

Data Freshness Timeline

(refreshed 7× in last 7d / 17× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 138 total refreshes for this CVE.

  1. 2026-10-10 19:54 UTCEPSS rescore
  2. 2026-10-09 20:00 UTCEPSS rescore
  3. 2026-10-08 16:33 UTCEPSS rescore
  4. 2026-10-07 23:37 UTCEPSS rescore
  5. 2026-10-06 15:09 UTCEPSS rescore
  6. 2026-10-05 17:37 UTCEPSS rescore
  7. 2026-10-04 23:44 UTCOSV refresh
  8. 2026-09-30 14:58 UTCEPSS rescore
  9. 2026-09-29 07:59 UTCEG score recompute
  10. 2026-09-27 13:39 UTCEPSS rescore
  11. 2026-09-26 15:52 UTCEPSS rescore
  12. 2026-09-24 13:57 UTCEPSS rescore
  13. 2026-09-17 19:20 UTCEPSS rescore
  14. 2026-09-15 07:54 UTCOSV refresh
  15. 2026-09-15 03:04 UTCEPSS rescore
  16. 2026-09-13 16:40 UTCEPSS rescore
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  20. 2026-09-05 15:22 UTCEPSS rescore
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  22. 2026-08-28 21:34 UTCEPSS rescore
  23. 2026-08-27 14:19 UTCEPSS rescore
  24. 2026-08-27 07:23 UTCOSV refresh
  25. 2026-08-25 13:43 UTCEPSS rescore
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  1. 2026-08-19 16:58 UTCEPSS rescore
  2. 2026-08-15 01:24 UTCEPSS rescore
  3. 2026-08-10 20:38 UTCOSV refresh
  4. 2026-08-09 13:41 UTCEPSS rescore
  5. 2026-08-08 16:31 UTCEPSS rescore
  6. 2026-08-06 13:41 UTCEPSS rescore
  7. 2026-08-03 10:28 UTCEPSS rescore
  8. 2026-07-30 16:22 UTCEPSS rescore
  9. 2026-07-30 01:26 UTCEPSS rescore
  10. 2026-07-25 20:31 UTCOSV refresh
  11. 2026-07-25 14:12 UTCEPSS rescore
  12. 2026-07-24 14:12 UTCEPSS rescore
  13. 2026-07-23 14:14 UTCEPSS rescore
  14. 2026-07-23 00:59 UTCEG score recompute
  15. 2026-07-23 00:37 UTCEG score recompute
  16. 2026-07-23 00:04 UTCEG score recompute
  17. 2026-07-22 21:43 UTCEG score recompute
  18. 2026-07-22 14:03 UTCEPSS rescore
  19. 2026-07-21 15:20 UTCEPSS rescore
  20. 2026-07-20 17:03 UTCEPSS rescore
  21. 2026-07-20 17:03 UTCEPSS rescore
  22. 2026-07-18 09:59 UTCEPSS rescore
  23. 2026-07-16 16:58 UTCEPSS rescore
  24. 2026-07-15 16:54 UTCEPSS rescore
  25. 2026-07-15 16:54 UTCEPSS rescore
  26. 2026-07-15 01:55 UTCEPSS rescore
  27. 2026-07-13 22:25 UTCEPSS rescore
  28. 2026-07-11 08:22 UTCEPSS rescore
  29. 2026-07-11 08:22 UTCEPSS rescore
  30. 2026-07-09 19:04 UTCEPSS rescore
  31. 2026-07-08 15:15 UTCOSV refresh
  32. 2026-07-08 15:10 UTCEPSS rescore
  33. 2026-07-06 16:23 UTCEPSS rescore
  34. 2026-07-06 02:19 UTCEPSS rescore
  35. 2026-07-06 02:19 UTCEPSS rescore
  36. 2026-07-05 02:26 UTCEPSS rescore
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  38. 2026-07-04 06:27 UTCEPSS rescore
  39. 2026-07-01 15:02 UTCEPSS rescore
  40. 2026-06-30 23:19 UTCEPSS rescore
  41. 2026-06-29 14:02 UTCEPSS rescore
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  43. 2026-06-28 14:03 UTCEPSS rescore
  44. 2026-06-28 04:52 UTCEPSS rescore
  45. 2026-06-28 04:52 UTCEPSS rescore
  46. 2026-06-27 03:05 UTCEPSS rescore
  47. 2026-06-25 13:46 UTCEPSS rescore
  48. 2026-06-25 13:46 UTCEPSS rescore
  49. 2026-06-24 14:02 UTCEPSS rescore
  50. 2026-06-24 14:02 UTCEPSS rescore
  51. 2026-06-23 21:29 UTCEPSS rescore
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  53. 2026-06-22 14:22 UTCEPSS rescore
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  55. 2026-06-21 14:53 UTCEPSS rescore
  56. 2026-06-21 01:56 UTCEPSS rescore
  57. 2026-06-21 01:56 UTCEPSS rescore
  58. 2026-06-20 03:12 UTCOSV refresh
  59. 2026-06-19 19:22 UTCEPSS rescore
  60. 2026-06-19 19:22 UTCEPSS rescore
  61. 2026-06-18 17:49 UTCEPSS rescore
  62. 2026-06-18 17:49 UTCEPSS rescore
  63. 2026-06-17 17:49 UTCEPSS rescore
  64. 2026-06-17 17:49 UTCEPSS rescore
  65. 2026-06-16 17:49 UTCEPSS rescore
  66. 2026-06-16 17:49 UTCEPSS rescore
  67. 2026-06-15 17:44 UTCEPSS rescore
  68. 2026-06-14 23:14 UTCEPSS rescore
  69. 2026-06-14 23:14 UTCEPSS rescore
  70. 2026-06-13 22:57 UTCEPSS rescore
  71. 2026-06-12 23:08 UTCEPSS rescore
  72. 2026-06-12 23:08 UTCEPSS rescore
  73. 2026-06-10 22:14 UTCEPSS rescore
  74. 2026-06-10 13:17 UTCEPSS rescore
  75. 2026-06-08 14:13 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2009-2422?
CVE-2009-2422 is a critical vulnerability published on July 10, 2009. The example code for the digest authentication functionality (httpauthentication.rb) in Ruby on Rails before 2.3.3 defines an authenticateorrequestwithhttpdigest block that returns nil instead of false when the user does not exist, which allows context-dependent attackers to bypass authentication…
When was CVE-2009-2422 disclosed?
CVE-2009-2422 was first published on July 10, 2009, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2009-2422 actively exploited?
CVE-2009-2422 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.4% probability of exploitation in the next 30 days (88th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2009-2422?
CVE-2009-2422 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2009-2422?
A fix for CVE-2009-2422 is available: update to the fixed version the vendor names in its advisory.

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