CVE-2024-40720

Name: CVE-2024-40720
Creator: NVD / NIST
Published: 2024-08-02T11:16:42.763+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.56%

Last modified Jun 17, 2026

CVE-2024-40720 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. The specific API in TCBServiSign Windows Version from CHANGING Information Technology does not properly validate server-side input. When a user visits a spoofed website, unauthenticated remote attackers can modify the `HKEY_CURRENT_USER` registry to execute arbitrary commands.. EPSS estimates a 0.56% chance of exploitation in the next 30 days.

Description

The specific API in TCBServiSign Windows Version from CHANGING Information Technology does not properly validate server-side input. When a user visits a spoofed website, unauthenticated remote attackers can modify the `HKEY_CURRENT_USER` registry to execute arbitrary commands.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.56%

42.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Changingtec	Tcb Servisign	< 1.0.24.0318

References

https://www.twcert.org.tw/en/cp-139-7971-d9584-2.htmlThird Party Advisory
https://www.twcert.org.tw/tw/cp-132-7965-8285d-1.htmlThird Party Advisory

Timeline

Published: Aug 2, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2024-40720?

How severe is CVE-2024-40720?

CVE-2024-40720 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.56% probability of exploitation in the next 30 days.

How do I fix CVE-2024-40720?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-40720?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST