Threats / Microsoft / CVE-2025-32706
CVE-2025-32706
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-08-04
Microsoft Windows vulnerability
A heap-based buffer overflow in the Windows Common Log File System (CLFS) Driver allows authorized local attackers to elevate privileges.
Verdict
Today item — known-exploited.
This vulnerability requires local access and prior authorization but enables privilege escalation through memory corruption. Active exploitation in the wild increases risk despite the narrow attack surface.
CISA KEV Yes · 2025-05-135EPSS 0.02139 (verify live)6CVSS 7.83CISA SSVC Exploitation: active · Automatable: no · Impact: total4
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
6 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-05-13).
Probability (EPSS)
EPSS 0.02139 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C) · Affected: Microsoft, Windows. Confirm exact fixed builds in the vendor advisory.CVSS — CNA-assigned (CVE.org), version 3.1, set at disclosure.
Weakness (CWE)
Mapped to CWE-20 Improper Input Validation.CWE — CNA-assigned (CVE.org); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: no · Technical Impact: totalCISA's own stakeholder-specific triage inputs, published in the CVE record (CISA Coordinator role). NOTE: this is CISA's three decision points; the final Act/Attend/Track decision also requires a Mission & Well-being input not published here, so no overall decision is asserted.
Currency of the record
CISA added this to its KEV catalog the same day the CVE record was published.KEV lag = CISA-KEV dateAdded − CVE.org datePublished; a floor on how long the known-exploited flaw sat in the public record before the federal catalog listed it. Severity/weakness here is CNA- or CISA-assigned (current at disclosure), independent of NVD's analysis backlog.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I gain initial access as a standard user or service account on a Windows system.
Business
An insider or compromised low-privilege account exists within the environment.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I craft a malicious input to the CLFS Driver that triggers a heap buffer overflow.
Business
The CLFS Driver processes untrusted data without proper bounds validation.
3
Lateral reach — past segmentation narrative 3
Attacker
I corrupt heap memory to overwrite control structures and redirect execution.
Business
Memory safety controls fail to prevent exploitation of the buffer overflow.
4
Data at risk — exfiltration narrative 4
Attacker
I execute arbitrary code with elevated system privileges.
Business
The attacker gains SYSTEM-level access and can install malware, modify system configuration, or access sensitive data.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05