CVE-2015-2546

CRITICALNVD 8.29.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-03-15), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.2 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: 11%CVSS: 8.2Exploit: cisa kev · ssvc active · kev ransomware · epss top5pct · public exploitExposed: 0

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

The kernel-mode driver in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT Gold and 8.1, and Windows 10 allows local users to gain privileges via a crafted application, aka "Win32k Memory Corruption Elevation of Privilege Vulnerability," a different vulnerability than CVE-2015-2511, CVE-2015-2517, and CVE-2015-2518.

CVSS v3
8.2
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
11%
EPSS %ILE
96%
KEV
⚠ Exploited

Published

September 9, 2015

Last Modified

August 14, 2026

Advisory Details (3)

Auto-updated May 4, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2015-2546
generic

Microsoft Security Bulletin MS15-097 - Critical | Microsoft Learn

https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-097
generic
http://www.securityfocus.com/bid/76608

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 56× in last 7d / 211× 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 639 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCk0keoyo/CVE-2015-2546-Exploit
    First seen May 25, 2017
    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2015-2546?
CVE-2015-2546 is a critical vulnerability published on September 9, 2015. The kernel-mode driver in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT Gold and 8.1, and Windows 10 allows local users to gain privileges via a crafted application, aka "Win32k Memory Corruption…
When was CVE-2015-2546 disclosed?
CVE-2015-2546 was first published in the National Vulnerability Database on September 9, 2015, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-2546 actively exploited?
Yes. CISA added CVE-2015-2546 to the Known Exploited Vulnerabilities catalog on March 15, 2022, affecting Microsoft Win32k. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2015-2546?
CVE-2015-2546 has a CVSS v3 base score of 8.2 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2015-2546?
CVE-2015-2546 affects Microsoft Win32k. 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-2015-2546?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-2546, 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.

Dependency Blast Radius

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