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High Severity Vulnerability

This vulnerability has been rated as High severity. Immediate action is recommended.

CVE-2026-20810

High
Low Medium High Critical
7.8
CVSS Score
Published: Jan 13, 2026
Last Modified: Jan 14, 2026
CWE: CWE-590

Vulnerability Description

Free of memory not on the heap in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVSS Metrics

Common Vulnerability Scoring System

Vector String:

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
L
Attack Complexity
L
Privileges Required
L
User Interaction
N
Scope
U
Confidentiality
H
Integrity
H
Availability
H

Known Affected Software

106 configuration(s) from 1 vendor(s)

windows_server_2019
Version:
10.0.17763.2029
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2029:*:*:*:datacenter:*:x64:*
windows_10_22h2
Version:
10.0.19045.2728
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.2728:*:*:*:*:*:arm64:*
windows_server_2019
Version:
10.0.17763.7434
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.7434:*:*:*:*:*:x64:*
windows_server_2019
Version:
10.0.17763.2061
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2061:*:*:*:standard:*:x64:*
windows_server_2019
Version:
10.0.17763.3887
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.3887:*:*:*:standard:*:x64:*
windows_10_22h2
Version:
10.0.19045.2788
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.2788:*:*:*:*:*:arm64:*
windows_server_2019
Version:
10.0.17763.7919
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.7919:*:*:*:*:*:x64:*
windows_10_22h2
Version:
10.0.19045.3930
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.3930:*:*:*:*:*:arm64:*
windows_10_22h2
Version:
10.0.19045.5011
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.5011:*:*:*:*:*:arm64:*
windows_server_2019
Version:
10.0.17763.3287
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.3287:*:*:*:standard:*:x64:*
windows_10_22h2
Version:
10.0.19045.5371
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.5371:*:*:*:*:*:arm64:*
windows_server_2019
Version:
10.0.17763.4974
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.4974:*:*:*:standard:*:x64:*
windows_10_22h2
Version:
10.0.19045.4046
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.4046:*:*:*:*:*:x86:*
windows_server_2019
Version:
10.0.17763.4737
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.4737:*:*:*:standard:*:x64:*
windows_10_22h2
Version:
10.0.19045.4651
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.4651:*:*:*:*:*:arm64:*
windows_10_22h2
Version:
10.0.19045.4291
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.4291:*:*:*:*:*:x64:*
windows_10_22h2
Version:
10.0.19045.4412
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.4412:*:*:*:*:*:x64:*
windows_server_2019
Version:
10.0.17763.4131
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.4131:*:*:*:-:*:x64:*
windows_server_2019
Version:
10.0.17763.6893
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.6893:*:*:*:-:*:x64:*
windows_server_2019
Version:
10.0.17763.8027
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.8027:*:*:*:-:*:x64:*
windows_10_22h2
Version:
10.0.19045.3803
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.3803:*:*:*:*:*:*:*
windows_10_22h2
Version:
10.0.19045.3516
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.3516:*:*:*:*:*:arm64:*
windows_10_22h2
Version:
10.0.19045.5737
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.5737:*:*:*:*:*:arm64:*
windows_10_22h2
Version:
10.0.19045.2673
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.2673:*:*:*:*:*:arm64:*
windows_10_22h2
Version:
10.0.19045.5608
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.5608:*:*:*:*:*:arm64:*
windows_server_2019
Version:
10.0.17763.6414
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.6414:*:*:*:*:*:*:*
windows_server_2019
Version:
10.0.17763.2452
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2452:*:*:*:standard:*:x64:*
windows_server_2019
Version:
10.0.17763.7792
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.7792:*:*:*:-:*:x64:*
windows_server_2019
Version:
10.0.17763.7783
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.7783:*:*:*:-:*:x64:*
windows_server_2019
Version:
10.0.17763.3046
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.3046:*:*:*:standard:*:x64:*
windows_server_2019
Version:
10.0.17763.6293
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.6293:*:*:*:standard:*:x64:*
windows_10_22h2
Version:
10.0.19045.6575
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.6575:*:*:*:*:*:arm64:*
windows_10_22h2
Version:
10.0.19041.3920
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19041.3920:*:*:*:*:*:x64:*
windows_10_22h2
Version:
10.0.19045.2965
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.2965:*:*:*:*:*:arm64:*
windows_10_22h2
Version:
10.0.19045.2604
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.2604:*:*:*:*:*:arm64:*
windows_10_22h2
Version:
10.0.19045.2486
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.2486:*:*:*:*:*:x64:*
windows_10_22h2
Version:
10.0.19045.2846
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.2846:*:*:*:*:*:arm64:*
windows_server_2019
Version:
10.0.17763.6532
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.6532:*:*:*:standard:*:x64:*
windows_server_2019
Version:
10.0.17763.5936
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.5936:*:*:*:standard:*:x64:*
windows_server_2019
Version:
10.0.17763.5458
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.5458:*:*:*:standard:*:x64:*
windows_server_2019
Version:
10.0.17763.2803
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2803:*:*:*:standard:*:x64:*
windows_10_22h2
Version:
10.0.19045.2546
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.2546:*:*:*:*:*:arm64:*
windows_server_2019
Version:
10.0.17763.2565
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2565:*:*:*:standard:*:x64:*
windows_10_22h2
Version:
10.0.19045.6332
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.6332:*:*:*:*:*:arm64:*
windows_server_2019
Version:
10.0.17763.5576
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.5576:*:*:*:standard:*:x64:*
windows_10_22h2
Version:
10.0.19045.5854
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.5854:*:*:*:*:*:x64:*
windows_server_2019
Version:
10.0.17763.7136
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.7136:*:*:*:-:*:x64:*
windows_10_22h2
Version:
10.0.19045.3271
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.3271:*:*:*:*:*:arm64:*
windows_10_22h2
Version:
10.0.19045.4894
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.4894:*:*:*:*:*:x86:*
windows_10_22h2
Version:
10.0.19045.4170
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.4170:*:*:*:*:*:x64:*
windows_server_2019
Version:
10.0.17763.2183
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2183:*:*:*:standard:*:x64:*
windows_10_22h2
Version:
10.0.19045.2913
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.2913:*:*:*:*:*:arm64:*
windows_server_2019
Version:
10.0.17763.2928
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2928:*:*:*:standard:*:x64:*
windows_10_22h2
Version:
10.0.19045.3086
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.3086:*:*:*:*:*:arm64:*
windows_server_2019
Version:
10.0.17763.6189
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.6189:*:*:*:standard:*:x64:*
windows_server_2019
Version:
10.0.17763.6054
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.6054:*:*:*:standard:*:x64:*
windows_10_22h2
Version:
10.0.19045.6321
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.6321:*:*:*:*:*:arm64:*
windows_server_2019
Version:
10.0.17763.7009
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.7009:*:*:*:*:*:x64:*
windows_10_22h2
Version:
10.0.19045.2364
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.2364:*:*:*:*:*:arm64:*
windows_server_2019
Version:
10.0.17763.2114
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2114:*:*:*:standard:*:x64:*
windows_10_22h2
Version:
10.0.19045.2130
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.2130:*:*:*:*:*:arm64:*
windows_server_2019
Version:
10.0.17763.5820
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.5820:*:*:*:standard:*:x64:*
windows_10_22h2
Version:
10.0.19045.3208
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.3208:*:*:*:*:*:arm64:*
windows_server_2019
Version:
10.0.17763.2237
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2237:*:*:*:standard:*:x64:*
windows_server_2019
Version:
10.0.17763.4499
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.4499:*:*:*:standard:*:x64:*
windows_server_2019
Version:
10.0.17763.5122
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.5122:*:*:*:standard:*:x64:*
windows_server_2019
Version:
10.0.17763.7314
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.7314:*:*:*:-:*:x64:*
windows_server_2019
Version:
10.0.17763.7678
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.7678:*:*:*:-:*:x64:*
windows_server_2019
Version:
10.0.17763.4252
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.4252:*:*:*:standard:*:x64:*
windows_10_22h2
Version:
10.0.19045.5247
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.5247:*:*:*:*:*:x86:*
windows_10_22h2
Version:
10.0.19044.2486
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19044.2486:*:*:*:*:*:arm64:*
windows_10_22h2
Version:
10.0.19045.6216
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.6216:*:*:*:*:*:x86:*
windows_server_2019
Version:
10.0.17763.3406
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.3406:*:*:*:standard:*:x64:*
windows_server_2019
Version:
10.0.17763.5329
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.5329:*:*:*:*:*:*:*
windows_server_2019
Version:
10.0.17763.1999
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.1999:*:*:*:standard:*:x64:*
windows_10_22h2
Version:
10.0.19045.6456
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.6456:*:*:*:*:*:x64:*
windows_server_2019
Version:
10.0.17763.7922
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.7922:*:*:*:-:*:x64:*
windows_server_2019
Version:
10.0.17763.3770
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.3770:*:*:*:standard:*:x64:*
windows_10_22h2
Version:
10.0.19045.3693
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.3693:*:*:*:*:*:arm64:*
windows_server_2019
Version:
10.0.17763.6659
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.6659:*:*:*:*:*:*:*
windows_10_22h2
Version:
10.0.19045.5965
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.5965:*:*:*:*:*:arm64:*
windows_10_22h2
Version:
10.0.19045.5131
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.5131:*:*:*:*:*:arm64:*
windows_10_22h2
Version:
10.0.19045.6093
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.6093:*:*:*:*:*:arm64:*
windows_10_22h2
Version:
10.0.19044.3324
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19044.3324:*:*:*:*:*:x86:*
windows_server_2019
Version:
10.0.17763.3532
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.3532:*:*:*:standard:*:x64:*
windows_10_22h2
Version:
10.0.19045.3570
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.3570:*:*:*:*:*:arm64:*
windows_10_22h2
Version:
10.0.19045.5487
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.5487:*:*:*:*:*:x86:*
windows_server_2019
Version:
10.0.17763.5696
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.5696:*:*:*:standard:*:x64:*
windows_server_2019
Version:
10.0.17763.7558
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.7558:*:*:*:-:*:x64:*
windows_10_22h2
Version:
10.0.19045.3393
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.3393:*:*:*:*:*:arm64:*
windows_server_2019
Version:
10.0.17763.3650
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.3650:*:*:*:standard:*:x64:*
windows_server_2019
Version:
10.0.17763.4645
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.4645:*:*:*:standard:*:x64:*
windows_server_2019
Version:
10.0.17763.2366
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2366:*:*:*:standard:*:x64:*
windows_server_2019
Version:
10.0.17763.4851
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.4851:*:*:*:standard:*:x64:*
windows_10_22h2
Version:
10.0.19045.3324
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.3324:*:*:*:*:*:arm64:*
windows_10_22h2
Version:
10.0.19045.2251
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.2251:*:*:*:*:*:arm64:*
windows_10_22h2
Version:
10.0.19045.3448
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.3448:*:*:*:*:*:arm64:*
windows_10_22h2
Version:
10.0.19042.2486
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19042.2486:*:*:*:*:*:arm64:*
windows_10_22h2
Version:
10.0.19045.2311
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.2311:*:*:*:*:*:arm64:*
windows_server_2019
Version:
10.0.17763.2300
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2300:*:*:*:standard:*:x64:*
windows_10_22h2
Version:
10.0.19045.3087
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.3087:*:*:*:*:*:arm64:*
windows_10_22h2
Version:
10.0.19045.3031
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.3031:*:*:*:*:*:arm64:*
windows_server_2019
Version:
10.0.17763.3165
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.3165:*:*:*:standard:*:x64:*
windows_10_22h2
Version:
10.0.19045.3155
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.3155:*:*:*:*:*:arm64:*
windows_server_2019
Version:
10.0.17763.4010
CPE:
cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.4010:*:*:*:*:*:*:*
windows_10_22h2
Version:
10.0.19045.4780
CPE:
cpe:2.3:o:microsoft:windows_10_22h2:10.0.19045.4780:*:*:*:*:*:x64:*
This vulnerability affects 106 software configuration(s). Ensure you patch all affected systems.

References & Resources

Severity Details

7.8
out of 10.0
High

Weakness Type (CWE)

CWE-590

Free of Memory not on the Heap

Description
The product calls free() on a pointer to memory that was not allocated using associated heap allocation functions such as malloc(), calloc(), or realloc().
Typical Severity
Medium
Abstraction Level
Variant
View CWE Details on MITRE

Key Information

Published Date
January 13, 2026

External Resources

NIST
NIST NVD
National Vulnerability Database
MT
MITRE CVE
Official CVE record

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