CVE-2022-21125

Local data disclosure via stale fill-buffer sampling

Published Jun 15, 2022 · Updated May 5, 2025

Information disclosure in some Intel Processors allows local users to sample stale data from microarchitectural fill buffers. MMIO operations can propagate stale data from uncore buffers or mapped registers into core fill buffers, where an unmitigated transient-execution path samples it across security contexts. Low-privileged code must run locally on an affected MDS-vulnerable client CPU, and exposed data depends on the processor and system configuration.

CVSS severity5.6
Medium
EPSS probability6.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in some Intel Processors allows local users to sample stale data from microarchitectural fill buffers. MMIO operations can propagate stale data from uncore buffers or mapped registers into core fill buffers, where an unmitigated transient-execution path samples it across security contexts. Low-privileged code must run locally on an affected MDS-vulnerable client CPU, and exposed data depends on the processor and system configuration.

The record

CVE
CVE-2022-21125
Published
Jun 15, 2022
Updated
May 5, 2025
Vendor
Topcon Positioning Systems, Inc.
Product
Intel Processors
Classifications
CWE-459, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 15, 2022CVE publishedPublication date reported by the CVE source.
  2. May 5, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=See references

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Topcon Positioning Systems, Inc. · Intel Processorsversion=See references

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
5.6Intel CorporationCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
2.1NIST NVDAV:L/AC:L/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-459Incomplete Cleanup
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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