CVE-2023-40252

Local trusted executable replacement

Published Aug 17, 2023 · Updated Oct 1, 2024

Code injection in Genians Genian NAC and Genian ZTNA allows local users with high privileges to replace a trusted executable during updates. The vendor associates the flaw with Genian Update servers and affected Policy Server, Network Sensor, and Agent components but does not disclose the faulty function or validation step. Exploitation requires local high privileges and changes executable integrity; the CNA reports no confidentiality or availability impact.

CVSS severity9.8
Critical
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Genians Genian NAC and Genian ZTNA allows local users with high privileges to replace a trusted executable during updates. The vendor associates the flaw with Genian Update servers and affected Policy Server, Network Sensor, and Agent components but does not disclose the faulty function or validation step. Exploitation requires local high privileges and changes executable integrity; the CNA reports no confidentiality or availability impact.

The record

CVE
CVE-2023-40252
Published
Aug 17, 2023
Updated
Oct 1, 2024
Vendor
Genians
Product
Genian NAC
Classifications
CWE-94, CAPEC-558
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=V4.0.0 <=V4.0.155 changes=[{"at":"V4.0.156","status":"unaffected"}]
  2. Affected versionversion=V5.0.0 <=V5.0.42 (Revision 117460) changes=[{"at":"V5.0.42 (Revision 117461)","status":"unaffected"}]
  3. Affected versionversion=V5.0.0 <=V5.0.54 changes=[{"at":"V5.0.55","status":"unaffected"}]

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Genians · Genian NACversion=V4.0.0 <=V4.0.155 changes=[{"at":"V4.0.156","status":"unaffected"}]; version=V5.0.0 <=V5.0.42 (Revision 117460) changes=[{"at":"V5.0.42 (Revision 117461)","status":"unaffected"}]; version=V5.0.0 <=V5.0.54 changes=[{"at":"V5.0.55","status":"unaffected"}]
Genians · Genian ZTNAversion=V6.0.0 <=V6.0.15 changes=[{"at":"V6.0.16","status":"unaffected"}]

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.0KrCERT/CCCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:H/A: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-94Improper Control of Generation of Code ('Code Injection')
CAPEC-558Replace Trusted Executable

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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