OnlyPatch
Windows Storage Spaces Controller

CVE-2022-21877 — Storage Spaces Controller Information Disclosure Vulnerability

Important CVSS 5.5 EPSS 0.02894 🔬 Patch diffed 2022-01 archive

Executive Summary

None

Overview

5.5
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Information Disclosure
Released Jan 11 2022
Last Updated Jan 11 2022
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.02894 — 0.85465 percentile
NVD CVSS 5.5 MEDIUM — matches MSRC

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
None
AVAILABILITY
None
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 4.8

EPSS Score

0.02894
probability of exploitation in the next 30 days
0.85465 percentile - updated 2026-07-25
View on FIRST.org

Affected Products

21 affected products
Product KB Article Severity Impact Restart Required
Windows 10 Version 1809 for 32-bit Systems 5009557 (Security Update) Important Information Disclosure Yes
Windows 10 Version 1809 for ARM64-based Systems 5009557 (Security Update) Important Information Disclosure Yes
Windows 10 Version 1809 for x64-based Systems 5009557 (Security Update) Important Information Disclosure Yes
Windows 10 Version 1909 for 32-bit Systems 5009545 (Security Update) Important Information Disclosure Yes
Windows 10 Version 1909 for ARM64-based Systems 5009545 (Security Update) Important Information Disclosure Yes
Windows 10 Version 1909 for x64-based Systems 5009545 (Security Update) Important Information Disclosure Yes
Windows 10 Version 20H2 for 32-bit Systems 5009543 (Security Update) Important Information Disclosure Yes
Windows 10 Version 20H2 for ARM64-based Systems 5009543 (Security Update) Important Information Disclosure Yes
Windows 10 Version 21H1 for 32-bit Systems 5009543 (Security Update) Important Information Disclosure Yes
Windows 10 Version 21H1 for ARM64-based Systems 5009543 (Security Update) Important Information Disclosure Yes
Windows 10 Version 21H1 for x64-based Systems 5009543 (Security Update) Important Information Disclosure Yes
Windows 10 Version 21H2 for 32-bit Systems 5009543 (Security Update) Important Information Disclosure Yes
Windows 10 Version 21H2 for ARM64-based Systems 5009543 (Security Update) Important Information Disclosure Yes
Windows 10 Version 21H2 for x64-based Systems 5009543 (Security Update) Important Information Disclosure Yes
Windows 11 version 21H2 for ARM64-based Systems 5009566 (Security Update) Important Information Disclosure Yes
Windows 11 version 21H2 for x64-based Systems 5009566 (Security Update) Important Information Disclosure Yes
Windows Server 2019 5009557 (Security Update) Important Information Disclosure Yes
Windows Server 2019 (Server Core installation) 5009557 (Security Update) Important Information Disclosure Yes
Windows Server 2022 5009555 (Security Update) Important Information Disclosure Yes
Windows Server 2022 (Server Core installation) 5009555 (Security Update) Important Information Disclosure Yes
Windows Server, version 20H2 (Server Core Installation) 5009543 (Security Update) Important Information Disclosure Yes

Patches

5 patches
Article Type Restart
5009557 Security Update Yes
5009545 Security Update Yes
5009543 Security Update Yes
5009566 Security Update Yes
5009555 Security Update Yes

Patch Diff

ghidriff · spaceport.sys (KB5009566)

Patch diff 10.0.22000.282 -> 10.0.22000.434 (Storage Spaces tier info bounds validation)

Pre-patch version 10.0.22000.282
Post-patch version 10.0.22000.434
Function Address Change Note
SP_POOL::SetSpaceInfoTransaction 1c009af5c -> 1c009af7c code, length, address, called similarity 0.3
RtlULongAdd 1c001db34 -> 1c001d8b8 refcount, address, calling similarity 1.0
SP_POOL::SetTierInfoTransaction 1c009b284 -> 1c009b300 code, length, address, called similarity 0.27
SpIoctlCreateTier 1c008dac8 code, length, called similarity 0.43
View full diff report View RCA report Download PoC

Known Exploits

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