CVE-2026-83670: Out-of-bounds read in Function Discovery Service (fdwsd.dll) allows an unauthorized attacker to disclose information over a network.

PriorityP345high7.5CVSS 3.1

AVNACLPRNUINSUCHINAN

EPSS

0.96%

61.4th percentile

Out-of-bounds read in Function Discovery Service (fdwsd.dll) allows an unauthorized attacker to disclose information over a network.

Affected

15 ranges

Vendor	Product	Version range	Fixed in
microsoft	windows_10_version_1607	>= 10.0.14393.0 < 10.0.14393.9612	10.0.14393.9612
microsoft	windows_10_version_1809	>= 10.0.17763.0 < 10.0.17763.9376	10.0.17763.9376
microsoft	windows_10_version_21h2	>= 10.0.19044.0 < 10.0.19044.7807	10.0.19044.7807
microsoft	windows_10_version_22h2	>= 10.0.19045.0 < 10.0.19045.7807	10.0.19045.7807
microsoft	windows_11_version_23h2	>= 10.0.22631.0 < 10.0.22631.7652	10.0.22631.7652
microsoft	windows_11_version_24h2	>= 10.0.26100.0 < 10.0.26100.9711	10.0.26100.9711
microsoft	windows_11_version_25h2	>= 10.0.26200.0 < 10.0.26200.9711	10.0.26200.9711
microsoft	windows_11_version_26h1	>= 10.0.28000.0 < 10.0.28000.3231	10.0.28000.3231
microsoft	windows_11_version_26h2	>= 10.0.26300.0 < 10.0.26300.9711	10.0.26300.9711
microsoft	windows_server_2012	>= 6.2.9200.0 < 6.2.9200.26434	6.2.9200.26434
microsoft	windows_server_2012_r2	>= 6.3.9600.0 < 6.3.9600.23470	6.3.9600.23470
microsoft	windows_server_2016	>= 10.0.14393.0 < 10.0.14393.9612	10.0.14393.9612
microsoft	windows_server_2019	>= 10.0.17763.0 < 10.0.17763.9376	10.0.17763.9376
microsoft	windows_server_2022	>= 10.0.20348.0 < 10.0.20348.5761	10.0.20348.5761
microsoft	windows_server_2025	>= 10.0.26100.0 < 10.0.26100.33650	10.0.26100.33650

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.