CVE-2009-1123

CRITICALNVD 7.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-03-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 5%CVSS: 7.8Exploit: cisa kev · ssvc activeExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

The kernel in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold, SP1, and SP2, and Server 2008 SP2 does not properly validate changes to unspecified kernel objects, which allows local users to gain privileges via a crafted application, aka "Windows Kernel Desktop Vulnerability."

CVSS v3
7.8
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
5%
EPSS %ILE
91%
KEV
⚠ Exploited

Published

June 10, 2009

Last Modified

April 22, 2026

Advisory Details (4)

Auto-updated May 19, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic
http://www.securitytracker.com/id?1022359
generic

About Secunia Research | Flexera

http://secunia.com/advisories/35372
generic🟡 PoC Available

Microsoft Security Bulletin MS09-025 - Important | Microsoft Learn

https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-025
generic

VUPEN Security - Vulnerability Research and Intelligence

http://www.vupen.com/english/advisories/2009/1544

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 60× in last 7d / 252× 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 764 total refreshes for this CVE.

  1. 2026-08-27 18:50 UTCGHSA enrichment
  2. 2026-08-27 17:22 UTCCISA KEV update
  3. 2026-08-27 15:07 UTCEG score recompute
  4. 2026-08-27 15:07 UTCGHSA enrichment
  5. 2026-08-27 14:19 UTCEPSS rescore
  6. 2026-08-27 11:28 UTCGHSA enrichment
  7. 2026-08-27 07:48 UTCGHSA enrichment
  8. 2026-08-27 04:08 UTCGHSA enrichment
  9. 2026-08-27 00:28 UTCGHSA enrichment
  10. 2026-08-26 20:49 UTCGHSA enrichment
  11. 2026-08-26 17:41 UTCCISA KEV update
  12. 2026-08-26 17:10 UTCEG score recompute
  13. 2026-08-26 17:10 UTCGHSA enrichment
  14. 2026-08-26 13:28 UTCGHSA enrichment
  15. 2026-08-26 09:48 UTCGHSA enrichment
  16. 2026-08-26 06:07 UTCGHSA enrichment
  17. 2026-08-26 02:26 UTCGHSA enrichment
  18. 2026-08-25 22:47 UTCGHSA enrichment
  19. 2026-08-25 19:08 UTCGHSA enrichment
  20. 2026-08-25 15:29 UTCEG score recompute
  21. 2026-08-25 15:29 UTCGHSA enrichment
  22. 2026-08-25 13:43 UTCEPSS rescore
  23. 2026-08-25 11:49 UTCGHSA enrichment
  24. 2026-08-25 08:10 UTCGHSA enrichment
  25. 2026-08-25 04:25 UTCGHSA enrichment
Show 75 more
  1. 2026-08-25 00:46 UTCGHSA enrichment
  2. 2026-08-24 21:07 UTCGHSA enrichment
  3. 2026-08-24 18:52 UTCCISA KEV update
  4. 2026-08-24 17:27 UTCEG score recompute
  5. 2026-08-24 17:27 UTCGHSA enrichment
  6. 2026-08-24 13:48 UTCGHSA enrichment
  7. 2026-08-24 10:09 UTCEG score recompute
  8. 2026-08-24 10:09 UTCGHSA enrichment
  9. 2026-08-24 06:29 UTCGHSA enrichment
  10. 2026-08-24 02:50 UTCGHSA enrichment
  11. 2026-08-23 23:10 UTCGHSA enrichment
  12. 2026-08-23 19:31 UTCGHSA enrichment
  13. 2026-08-23 15:52 UTCGHSA enrichment
  14. 2026-08-23 12:13 UTCGHSA enrichment
  15. 2026-08-23 08:34 UTCGHSA enrichment
  16. 2026-08-23 04:54 UTCGHSA enrichment
  17. 2026-08-23 01:15 UTCEG score recompute
  18. 2026-08-23 01:15 UTCGHSA enrichment
  19. 2026-08-22 21:36 UTCGHSA enrichment
  20. 2026-08-22 17:57 UTCGHSA enrichment
  21. 2026-08-22 14:17 UTCGHSA enrichment
  22. 2026-08-22 10:36 UTCGHSA enrichment
  23. 2026-08-22 06:57 UTCGHSA enrichment
  24. 2026-08-22 03:17 UTCEG score recompute
  25. 2026-08-22 03:17 UTCGHSA enrichment
  26. 2026-08-21 23:38 UTCGHSA enrichment
  27. 2026-08-21 19:59 UTCGHSA enrichment
  28. 2026-08-21 16:49 UTCCISA KEV update
  29. 2026-08-21 16:19 UTCGHSA enrichment
  30. 2026-08-21 12:39 UTCGHSA enrichment
  31. 2026-08-21 09:00 UTCGHSA enrichment
  32. 2026-08-21 05:21 UTCGHSA enrichment
  33. 2026-08-21 01:41 UTCEG score recompute
  34. 2026-08-21 01:41 UTCGHSA enrichment
  35. 2026-08-20 22:02 UTCGHSA enrichment
  36. 2026-08-20 18:23 UTCGHSA enrichment
  37. 2026-08-20 17:06 UTCCISA KEV update
  38. 2026-08-20 14:43 UTCGHSA enrichment
  39. 2026-08-20 11:04 UTCGHSA enrichment
  40. 2026-08-20 07:23 UTCGHSA enrichment
  41. 2026-08-20 03:43 UTCGHSA enrichment
  42. 2026-08-20 00:03 UTCGHSA enrichment
  43. 2026-08-19 20:24 UTCEG score recompute
  44. 2026-08-19 20:24 UTCGHSA enrichment
  45. 2026-08-19 17:33 UTCCISA KEV update
  46. 2026-08-19 16:58 UTCEPSS rescore
  47. 2026-08-19 16:44 UTCGHSA enrichment
  48. 2026-08-19 13:05 UTCGHSA enrichment
  49. 2026-08-19 09:25 UTCGHSA enrichment
  50. 2026-08-19 05:46 UTCGHSA enrichment
  51. 2026-08-19 02:06 UTCGHSA enrichment
  52. 2026-08-18 22:26 UTCGHSA enrichment
  53. 2026-08-18 18:48 UTCGHSA enrichment
  54. 2026-08-18 16:58 UTCCISA KEV update
  55. 2026-08-18 15:09 UTCEG score recompute
  56. 2026-08-18 15:08 UTCGHSA enrichment
  57. 2026-08-18 11:26 UTCGHSA enrichment
  58. 2026-08-18 07:46 UTCGHSA enrichment
  59. 2026-08-18 04:06 UTCGHSA enrichment
  60. 2026-08-18 00:26 UTCGHSA enrichment
  61. 2026-08-17 20:45 UTCGHSA enrichment
  62. 2026-08-17 17:05 UTCEG score recompute
  63. 2026-08-17 17:05 UTCGHSA enrichment
  64. 2026-08-17 13:56 UTCCISA KEV update
  65. 2026-08-17 13:25 UTCGHSA enrichment
  66. 2026-08-17 09:45 UTCGHSA enrichment
  67. 2026-08-17 06:06 UTCGHSA enrichment
  68. 2026-08-17 02:27 UTCGHSA enrichment
  69. 2026-08-16 22:48 UTCGHSA enrichment
  70. 2026-08-16 19:09 UTCGHSA enrichment
  71. 2026-08-16 15:29 UTCEG score recompute
  72. 2026-08-16 15:29 UTCGHSA enrichment
  73. 2026-08-16 11:49 UTCGHSA enrichment
  74. 2026-08-16 08:10 UTCGHSA enrichment
  75. 2026-08-16 04:31 UTCEG score recompute

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Frequently asked(6)

What is CVE-2009-1123?
CVE-2009-1123 is a critical vulnerability published on June 10, 2009. The kernel in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold, SP1, and SP2, and Server 2008 SP2 does not properly validate changes to unspecified kernel objects, which allows local users to gain privileges via a crafted application, aka "Windows Kernel Desktop…
When was CVE-2009-1123 disclosed?
CVE-2009-1123 was first published in the National Vulnerability Database on June 10, 2009, with the most recent update on April 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2009-1123 actively exploited?
Yes. CISA added CVE-2009-1123 to the Known Exploited Vulnerabilities catalog on March 3, 2022, affecting Microsoft Windows. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2009-1123?
CVE-2009-1123 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2009-1123?
CVE-2009-1123 affects Microsoft Windows. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2009-1123?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-1123, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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