CVE-2021-46757

Local privilege escalation via unchecked secure memory buffer

Published Feb 13, 2024 · Updated May 7, 2025

Memory-boundary failure in AMD Ryzen Embedded V2000 and 5000 processors allows local users to escalate privileges through a malicious TA. ASP Secure OS insufficiently checks a memory buffer, letting the TA read and write the secure kernel virtual address space. A locally deployed malicious trusted application is required; successful exploitation compromises the secure kernel and raises its privileges.

CVSS severity7.8
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory-boundary failure in AMD Ryzen Embedded V2000 and 5000 processors allows local users to escalate privileges through a malicious TA. ASP Secure OS insufficiently checks a memory buffer, letting the TA read and write the secure kernel virtual address space. A locally deployed malicious trusted application is required; successful exploitation compromises the secure kernel and raises its privileges.

The record

CVE
CVE-2021-46757
Published
Feb 13, 2024
Updated
May 7, 2025
Vendor
Advanced Micro Devices, Inc.
Product
AMD Ryzen Embedded V2000 Series Processors
Classifications
CWE-119, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 13, 2024CVE publishedPublication date reported by the CVE source.
  2. May 7, 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=various

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Advanced Micro Devices, Inc. · AMD Ryzen Embedded V2000 Series Processorsversion=various
Advanced Micro Devices, Inc. · AMD Ryzen Embedded 5000version=various

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
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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