CVE-2026-20820High· 7.8▾ MidnightPoC availableHeap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 42.9 · likelihood 0.5 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Exploit-prediction probability, daily snapshots since Jul 31.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
2.5%
1 GitHub repo
2.5% → 2.6%
Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
windows_10_1607 < 10.0.14393.8783windows_10_1809 < 10.0.17763.8276windows_10_21h2 < 10.0.19044.6809windows_10_22h2 < 10.0.19045.6809windows_11_23h2 < 10.0.22631.6491windows_11_24h2 < 10.0.26100.7623windows_11_25h2 < 10.0.26200.7623windows_server_2008windows_server_2008 = r2windows_server_2012windows_server_2012 = r2windows_server_2016 < 10.0.14393.8783windows_server_2019 < 10.0.17763.8276windows_server_2022 < 10.0.20348.4648windows_server_2022_23h2 < 10.0.25398.2092windows_server_2025 < 10.0.26100.32230Upgrade past the affected range:
windows_10_1607 10.0.14393.8783windows_10_1809 10.0.17763.8276windows_10_21h2 10.0.19044.6809windows_10_22h2 10.0.19045.6809windows_11_23h2 10.0.22631.6491windows_11_24h2 10.0.26100.7623windows_11_25h2 10.0.26200.7623windows_server_2016 10.0.14393.8783windows_server_2019 10.0.17763.8276windows_server_2022 10.0.20348.4648windows_server_2022_23h2 10.0.25398.2092windows_server_2025 10.0.26100.32230Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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