CVE-2024-21820

Local privilege escalation via incorrect memory-controller permissions

Published Nov 13, 2024 · Updated Nov 3, 2025

Incorrect default permissions in Intel Xeon memory-controller configurations using Intel SGX allow privileged local users to escalate privileges. The affected configuration applies overly permissive defaults while SGX is enabled, but Intel has not disclosed which registers or access checks are misconfigured. Exploitation requires high-privilege local access and an SGX-enabled affected processor; the reported impact is confidentiality and integrity loss without service interruption.

CVSS severity8.5
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect default permissions in Intel Xeon memory-controller configurations using Intel SGX allow privileged local users to escalate privileges. The affected configuration applies overly permissive defaults while SGX is enabled, but Intel has not disclosed which registers or access checks are misconfigured. Exploitation requires high-privilege local access and an SGX-enabled affected processor; the reported impact is confidentiality and integrity loss without service interruption.

The record

CVE
CVE-2024-21820
Published
Nov 13, 2024
Updated
Nov 3, 2025
Vendor
Topcon Positioning Systems, Inc.
Product
5th Gen Intel Xeon Scalable Processors
Classifications
CWE-276, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Nov 13, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=c06f2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Topcon Positioning Systems, Inc. · 5th Gen Intel Xeon Scalable Processorsversion=c06f2
Topcon Positioning Systems, Inc. · Intel Xeon D Processorversion=606C1
Topcon Positioning Systems, Inc. · 4th Gen Intel Xeon Scalable Processorsversion=806f7; version=806f8
Topcon Positioning Systems, Inc. · 3rd Generation Intel Xeon Processor Scalable Familyversion=606A6

Published CVSS scores

7.2Intel CorporationCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N
8.5Intel CorporationCVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-276Incorrect Default Permissions
T1068Exploitation for Privilege Escalation

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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