CVE-2023-2873Public exploit

Local privilege escalation via unvalidated IOCTL UserBuffer

Published May 24, 2023 · Updated Aug 2, 2024

Memory corruption in Filseclab Corporation Twister Antivirus 8 allows local users to elevate privileges through crafted IOCTL requests. The filppd.sys IOControlCode handler accepts an unvalidated UserBuffer for four affected codes, allowing a normal user to write to an arbitrary kernel address. A standard local account must execute code on the Windows host; the published proof of concept triggers a system crash, while the documented write primitive supports privilege elevation.

CVSS severity7.8
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Filseclab Corporation Twister Antivirus 8 allows local users to elevate privileges through crafted IOCTL requests. The filppd.sys IOControlCode handler accepts an unvalidated UserBuffer for four affected codes, allowing a normal user to write to an arbitrary kernel address. A standard local account must execute code on the Windows host; the published proof of concept triggers a system crash, while the documented write primitive supports privilege elevation.

The record

CVE
CVE-2023-2873
Published
May 24, 2023
Updated
Aug 2, 2024
Vendor
Filseclab Corporation
Product
Twister Antivirus
Classifications
CWE-787, CWE-119, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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?

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

  1. Affected versionversion=8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Filseclab Corporation · Twister Antivirusversion=8

Published CVSS scores

7.8NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.3VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
4.3VulDBAV:L/AC:L/Au:S/C:P/I:P/A:P

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 exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
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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