immortalp0ny@immortalp0ny
Tiny root cause analysis for one of the vulnerabilities (CVE-2026-20840) that I have found in ntfs https://ptesc.tech/en/out-of-bounds-write-in-ntfspageupdateanalysis/ enjoy
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CVE-2026-20840Patch(microsoft / windows_10_1607)
LOWCVSS 7.8 · HIGHSignal is active with 2 mentions in latest observed window
Immediate actions
- Patch microsoft windows_10_1607 systems immediately
Recommended action window: Monitor and triage in normal cycle
NVD description
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.
1.0/ 10 priority
Sources & remediation
Vendor / third-party advisories
Weakness type (CWE)
CWE-122
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
STABLE
Are you affected?
If you run products in this scope, you should treat this CVE as relevant to your environment.
- windows_10_1607
- windows_10_1809
- windows_10_21h2
- windows_10_22h2
Threat summary
- Patch or workaround signal is available
- 4 mentions across 3 observed days
- Momentum state: stable
What's happening
- Patch or workaround mentioned in 1 signal
- Technical details provided in 2 signals
- General: 1 classified signal
- Peaked at 2 mentions on most recent observed day (2026-10-08)
- 4 total mentions across 3 days
Affected systems
Vendors
Products
windows_10_1607windows_10_1809windows_10_21h2windows_10_22h2windows_11_23h2windows_11_24h2windows_11_25h2windows_server_2008windows_server_2012windows_server_2016
2 versions affected across 14 products
Deep dive
Activity timeline4 mentions / 3d
Signal classification2 categories
Patch150.0%
General150.0%
Referenced assets5 URLs
Classification over time
| Date | Total | Labels |
|---|
| 2026-02-05 | 1 | Patch1 |
| 2026-04-29 | 1 | General1 |
Full discourse4 posts
STEALIEN@stealienGeneralDiffuto CVE 분석 리포트 #001 | CVE-2026-20840 https://ufo.stealien.com/2026-04-28/CVE-2026-20840-analysis-ko #Diffuto #사이버보안 #취약점분석 #AI보안 #Windows보안 악성 USB만으로 시스템 장악까지 가능했던 Windows NTFS 커널 취약점 분석 AI 기반 보안 엔진 Diffuto가 소스코드 없이 바이너리 기반으로 원인과 공격 경로를 수 초 만에 추적했습니다.
Post summary
A concise analysis of CVE‑2026‑20840, outlining a Windows NTFS kernel flaw that can be triggered by a malicious USB, but without providing PoC, exploit code, or patch details.
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Escalator@ptescalatorWe finally have a blog 👉 https://ptesc.tech/ Kicking off with an #NTFS series: CVE-2026-20840, an OOB write in ntfs!PageUpdateAnalysis via a crafted $LogFile. Write-up + PoC are live. https://t.co/VzQaleNTPe
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CVEDatabase.com@cvedatabasePatch🔐 CVE-2026-20840 & CVE-2026-20922 — Remote code execution bugs in Windows NTFS drivers. Local patching strongly advised. Find full CVE impact and guidance: 👉 https://cvedatabase.com/cve/CVE-2026-20840 👉 https://cvedatabase.com/cve/CVE-2026-20922 #WindowsSecurity #ZeroDay
Post summary
The post highlights two Windows NTFS driver RCE vulnerabilities and strongly advises local patching.
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CPE platform detail19 entries
19 of 19 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| OS | microsoft | windows_10_1607 | - | - | x64 |
| OS | microsoft | windows_10_1607 | - | - | x86 |
| OS | microsoft | windows_10_1809 | - | - | x64 |
| OS | microsoft | windows_10_1809 | - | - | x86 |
| OS | microsoft | windows_10_21h2 | - | - | - |
| OS | microsoft | windows_10_22h2 | - | - | - |
| OS | microsoft | windows_11_23h2 | - | - | - |
| OS | microsoft | windows_11_24h2 | - | - | - |
| OS | microsoft | windows_11_25h2 | - | - | - |
| OS | microsoft | windows_server_2008 | - | - | x64 |
| OS | microsoft | windows_server_2008 | - | - | x86 |
| OS | microsoft | windows_server_2008 | r2 | - | x64 |
| OS | microsoft | windows_server_2012 | - | - | - |
| OS | microsoft | windows_server_2012 | r2 | - | - |
| OS | microsoft | windows_server_2016 | - | - | - |
| OS | microsoft | windows_server_2019 | - | - | - |
| OS | microsoft | windows_server_2022 | - | - | - |
| OS | microsoft | windows_server_2022_23h2 | - | - | - |
| OS | microsoft | windows_server_2025 | - | - | - |