Vulnerability

CVE-2015-2546

High· 8.2KEVCVSS8.2EPSS41%

.rules3/5

Microsoft Win32k Memory Corruption Vulnerability

The kernel-mode driver in Microsoft Windows OS and Server allows local users to gain privileges via a crafted application.

Threat signal

98/100

Severe

Severity

high

CVSS

8.2

EPSS

41%

Active

KEV

CISA KEV — actively exploited

Ransomware: Known1530d overdue

AffectedMicrosoft — Win32k

Added to KEV

2022-03-15

Federal patch due (BOD 22-01)

2022-04-05

Required action (CISA verbatim)

Apply updates per vendor instructions.

Vendor advisory + references

https://nvd.nist.gov/vuln/detail/CVE-2015-2546

CISA description: “The kernel-mode driver in Microsoft Windows OS and Server allows local users to gain privileges via a crafted application.”

CVSS

v3.1Open in FIRST calculator →

8.2/ 10HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Attack VectorLocalRequires local access — shell, console, or local app.
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredLowStandard user privileges sufficient.
User InteractionRequiredRequires user action (click, file open, etc).
ScopeChangedImpact extends beyond the vulnerable component (e.g. sandbox escape).
Confidentiality ImpactHighTotal disclosure of sensitive data.
Integrity ImpactHighTotal compromise of integrity — full data modification possible.
Availability ImpactHighTotal loss of availability — full DoS possible.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

40.6%

probability of exploitation in next 30 days

p97

higher than 97% of all CVEs

3-day trend↑ 0pp

Above the FIRST 'patch on a priority schedule' threshold.

Vendor VEX

No VEX statements published for CVE-2015-2546. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCAct

Active exploitation with total impact on essential/support systems

exploitation: active
automatable: yes
impact: total
mission: support

Lifecycle

2022-03-15Added to CISA KEVransomware: Known
2022-03-15Published
2022-04-05Federal patch due (BOD 22-01)
2026-06-12Last modified1 source

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.