CVE-2020-12138Public exploit

SYSTEM privilege escalation via unrestricted memory mapping

Published Apr 27, 2020 · Updated Aug 4, 2024

Missing authorization in ATI Technologies atillk64.sys 5.11.9.0 allows local users to gain SYSTEM privileges through a driver request. The IOCTL handler accepts a caller-supplied physical address and length, maps those pages, and returns the user-space mapping without restricting low-privileged callers. Local low-privileged access to the atillk64 device is sufficient to read and overwrite kernel process data, including replacing a process token with a SYSTEM token.

CVSS severity8.8
High
EPSS probability3.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in ATI Technologies atillk64.sys 5.11.9.0 allows local users to gain SYSTEM privileges through a driver request. The IOCTL handler accepts a caller-supplied physical address and length, maps those pages, and returns the user-space mapping without restricting low-privileged callers. Local low-privileged access to the atillk64 device is sufficient to read and overwrite kernel process data, including replacing a process token with a SYSTEM token.

The record

CVE
CVE-2020-12138
Published
Apr 27, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-862, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 27, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0NIST NVDAV:N/AC:L/Au:S/C:C/I:C/A:C

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
T1068Exploitation for Privilege Escalation

Public exploit references

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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