CVE-2021-34484
HighExploitedPublic exploitWindows User Profile Service Elevation of Privilege Vulnerability
Published Nov 9, 2021 · Updated Aug 10, 2026 · Also known as TR-21-0894, TR-21-0900
Key Facts
Patch immediately- CVE-2021-34484 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Windows 10 1507 (Microsoft), Windows 10 1607 (Microsoft), Windows 10 1809 (Microsoft) and 16 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 28, 2022. Public exploit code is available.
- EPSS estimates a 22% probability of exploitation in the next 30 days.
- Fixed versions are available, including Windows 10 1507 10.0.10240.19022, Windows 10 1607 10.0.14393.4583, Windows 10 1809 10.0.17763.2114.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
22%
Higher than 97.6% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2021-34484 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Windows User Profile Service Elevation of Privilege Vulnerability
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Mar 31, 2022 | Apr 21, 2022 | Not reported |
| Industry KEV feed | Mar 28, 2022 | Apr 21, 2022 | Not reported |
| CIRCL KEV | Mar 31, 2022 | Apr 21, 2022 | Not reported |
| ENISA EUVD | Mar 31, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
48 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Windows 10 1507Microsoft | 10.0.10240.19022 | 10.0.10240.19022 |
| Windows 10 1607Microsoft | 10.0.14393.4583 | 10.0.14393.4583 |
| Windows 10 1809Microsoft | 10.0.17763.2114, 10.0.18363.1734, 10.0.19041.1165 | 10.0.17763.2114 |
| Windows 10 1909Microsoft | 10.0.18363.1734 | 10.0.18363.1734 |
| Windows 10 2004Microsoft | See advisory | 10.0.19041.1165 |
Patched Releases
Windows 10 1507
10.0.10240.19022
Windows 10 1607
10.0.14393.4583
Windows 10 1809
10.0.17763.2114, 10.0.18363.1734, 10.0.19041.1165
Windows 10 1909
10.0.18363.1734
Windows 10 2004
10.0.19041.1165
windows 10 20H2
10.0.19042.1165
windows 10 21H1
10.0.19043.1165
Windows 7
6.1.7601.25685
Windows 8.1
6.3.9600.20094
Windows Rt 8.1
6.3.9600.20094
Windows Server 2004
10.0.19041.1165
windows server 2008 R2
6.1.7601.25685
Windows Server 2008 Sp2
6.0.6003.21192
Windows Server 2012
6.2.9200.23435
windows server 2012 R2
6.3.9600.20094
Windows Server 2016
10.0.14393.4583
Windows Server 2019
10.0.17763.2114
windows server 20H2
10.0.19042.1165
Timeline
Publicly disclosed
Nov 9, 2021
Added to Industry KEV feed
Mar 28, 2022
Added to CISA KEV
Mar 31, 2022
Added to CIRCL KEV
Mar 31, 2022
Added to ENISA EUVD
Mar 31, 2022
Last updated
Aug 10, 2026
References
- advisoryhttp://feedproxy.google.com/~r/TheHackersNews/~3/HCq5CP-R_zU/critical-flaws-in-philips-tasy-emr.html
- advisoryhttps://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/configuring_and_managing_networking/getting-started-with-tipc_configuring-and-managing-networking
- advisoryhttps://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/tree/net/tipc/crypto.c
- advisoryhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v5.15&id=fa40d9734a57bcbfa79a280189799f76c88f7bb0
- advisoryhttps://gixtools.net/2021/11/critical-flaws-in-philips-tasy-emr-could-expose-patient-data/
FAQ
Common Questions.
Windows User Profile Service Elevation of Privilege Vulnerability
Affected: Windows 10 1507 (Microsoft) versions 10.0.10240.19022; Windows 10 1607 (Microsoft) versions 10.0.14393.4583; Windows 10 1809 (Microsoft) versions 10.0.17763.2114, 10.0.18363.1734, 10.0.19041.1165, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 28, 2022.
Yes. It was added on Mar 31, 2022 with a federal remediation due date of Apr 21, 2022.
Public exploit code is available.
Fixed versions are available, including Windows 10 1507 10.0.10240.19022, Windows 10 1607 10.0.14393.4583, Windows 10 1809 10.0.17763.2114.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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