CVE-2026-20820
HIGHCVSS 7.8/10EPSS 2.52%
Last modified
CVE-2026-20820 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.. EPSS estimates a 2.52% chance of exploitation in the next 30 days.
Description
Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Microsoft | Windows 10 1607 | < 10.0.14393.8783 | — |
| Microsoft | Windows 10 1809 | < 10.0.17763.8276 | — |
| Microsoft | Windows 10 21h2 | < 10.0.19044.6809 | — |
| Microsoft | Windows 10 22h2 | < 10.0.19045.6809 | — |
| Microsoft | Windows 11 23h2 | < 10.0.22631.6491 | — |
| Microsoft | Windows 11 24h2 | < 10.0.26100.7623 | — |
| Microsoft | Windows 11 25h2 | < 10.0.26200.7623 | — |
| Microsoft | Windows Server 2008 | All versions | Sp2 |
| Microsoft | Windows Server 2008 | r2 | Sp1 |
| Microsoft | Windows Server 2012 | All versions | — |
| Microsoft | Windows Server 2012 | r2 | — |
| Microsoft | Windows Server 2016 | < 10.0.14393.8783 | — |
| Microsoft | Windows Server 2019 | < 10.0.17763.8276 | — |
| Microsoft | Windows Server 2022 | < 10.0.20348.4648 | — |
| Microsoft | Windows Server 2022 23h2 | < 10.0.25398.2092 | — |
| Microsoft | Windows Server 2025 | < 10.0.26100.32230 | — |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-20820?
Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
How severe is CVE-2026-20820?
CVE-2026-20820 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 2.52% probability of exploitation in the next 30 days.
How do I fix CVE-2026-20820?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2026-20820?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST