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CVE-2024-40721

24
FAUCET Score

CVE-2024-40721 describes an input validation vulnerability in CHANGING Information Technology's TCBServiSign Windows Version. This flaw allows unauthenticated remote attackers to force the software to load a malicious DLL from an arbitrary path when a user visits a spoofed website. With a CVSS score of 8.8 (High), the vulnerability is easily exploitable over the network with low attack complexity, potentially leading to full compromise of confidentiality, integrity, and availability. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.0.24.0318CPE matchmatch criteria
cpe:2.3:a:changingtec:tcb_servisign:*:*:*:*:*:windows:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.56%
Probability of exploitation in next 30 days
EPSS Percentile
43.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0056 is in the 45th percentile among its peer group of 14,875 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 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 0.1 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

twcert.org.tw / en/cp-139-7972-01a6e-2.html
Third Party Advisory
twcert.org.tw / tw/cp-132-7966-8c6c3-1.html
Third Party Advisory