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CVE-2023-40254

27
FAUCET Score

CVE-2023-40254 is a critical "Download of Code Without Integrity Check" vulnerability affecting Genians Genian NAC (V4.0, V5.0, Suite V5.0) and Genian ZTNA products, allowing for malicious software updates. With a CVSS score of 9.8 (CRITICAL), this vulnerability is easily exploitable over the network with no user interaction, leading to complete compromise of confidentiality, integrity, and availability. While no public exploits or active exploitation have been observed, and community discussion is minimal, the high severity warrants immediate patching.

Impacted Technologies

VendorProductVersion(s)CPE
>= 4.0.0, < 4.0.156CPE matchmatch criteria
cpe:2.3:a:genians:genian_nac:*:*:*:*:-:*:*:*
>= 5.0.0, < 5.0.55CPE matchmatch criteria
cpe:2.3:a:genians:genian_nac:*:*:*:*:-:*:*:*
5.0.42CPE matchmatch criteria
cpe:2.3:a:genians:genian_nac:5.0.42:-:*:*:lts:*:*:*
5.0.42CPE matchmatch criteria
cpe:2.3:a:genians:genian_nac:5.0.42:revision_117460:*:*:lts:*:*:*
>= 6.0.0, < 6.0.16CPE matchmatch criteria
cpe:2.3:a:genians:genian_ztna:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
0.8
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.17%
Probability of exploitation in next 30 days
EPSS Percentile
7.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0017 is in the 0th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

docs.genians.com / nac/5.0/release/ko/advisories/GN-SA-2023-001.html