CVE-2021-27965Public exploit

Local privilege escalation via unchecked IOCTL buffers

Published Mar 5, 2021 · Updated Aug 3, 2024

Stack buffer overflow in MSI Dragon Center before 2.0.98.0 allows local users to elevate privileges through crafted driver requests. The MsIo64.sys driver before 1.1.19.1016 copies attacker-controlled data from four exposed IOCTL operations into a fixed-size kernel stack buffer without validating its length. A low-privileged process with access to the driver device can corrupt kernel memory and execute code with SYSTEM privileges on Windows.

CVSS severity9.8
Critical
EPSS probability11.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in MSI Dragon Center before 2.0.98.0 allows local users to elevate privileges through crafted driver requests. The MsIo64.sys driver before 1.1.19.1016 copies attacker-controlled data from four exposed IOCTL operations into a fixed-size kernel stack buffer without validating its length. A low-privileged process with access to the driver device can corrupt kernel memory and execute code with SYSTEM privileges on Windows.

The record

CVE
CVE-2021-27965
Published
Mar 5, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 5, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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

7.5NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/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 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-120Classic Buffer Overflow
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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