Windows Storage Spaces Controller Elevation of Privilege Vulnerability

published 2021-07-14 5 y ago modified 2026-08-10 2 mo ago also EUVD-2021-21167

cvss: 7.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.1%; EPSS 1.1% chance of exploitation in 30 days, percentile 64%
public exploits: 0; none known

Patch / fix

fixed in 6 links 2

Microsoft Windows 10 Version 1909 10.0.18363.1679
Microsoft Windows 10 Version 2004 10.0.19041.1110
Microsoft Windows 10 Version 20H2 10.0.19042.1110
Microsoft Windows 10 Version 21H1 10.0.19043.1110
Microsoft Windows Server version 2004 10.0.19041.1110
Microsoft Windows Server version 20H2 10.0.19042.1110

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 2 y ago (2024-01-08)

Exploit prediction

1.06% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.2	AV:L/AC:L/Au:N/C:C/I:C/A:C

Affected products

Microsoft Windows 10 Version 1909
Microsoft Windows 10 Version 2004
Microsoft Windows 10 Version 20H2
Microsoft Windows 10 Version 21H1
Microsoft Windows Server version 2004
Microsoft Windows Server version 20H2

Classification

Weakness

CWE-190 Integer Overflow or Wraparound

References

msrc.microsoft.com /update-guide/vulnerability/CVE-2021-34513
vendor-advisory, patch
portal.msrc.microsoft.com /en-US/security-guidance/advisory/CVE-2021-34513
patch, vendor-advisory
zerodayinitiative.com /advisories/ZDI-21-875/
third-party-advisory

Sources

CVE List CVE-2021-34513
NVD CVE-2021-34513

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary