How severe is CVE-2024-40721?

CVE-2024-40721 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2024-40721 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-40721?

CVE-2024-40721 affects Changingtec Tcb Servisign. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-40721?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2024-40721 have an EU (EUVD) identifier?

Yes. CVE-2024-40721 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-38586.

When was CVE-2024-40721 published?

CVE-2024-40721 was published on 2024-08-02 and last updated on 2026-06-17.

CVE-2024-40721

CVE-2024-40721 is a high-severity vulnerability in Changingtec Tcb Servisign with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-38586
Weakness: CWE-20
Affected product: Changingtec Tcb Servisign
Published: 2024-08-02
Last modified: 2026-06-17

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 cause the TCBServiSign to load a DLL from an arbitrary path.

Frequently asked questions

What is CVE-2024-40721?: 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 cause the TCBServiSign to load a DLL from an arbitrary path.
How severe is CVE-2024-40721?: CVE-2024-40721 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2024-40721 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-40721?: CVE-2024-40721 affects Changingtec Tcb Servisign. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-40721?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2024-40721 have an EU (EUVD) identifier?: Yes. CVE-2024-40721 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-38586.
When was CVE-2024-40721 published?: CVE-2024-40721 was published on 2024-08-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:changingtec:tcb_servisign:*:*:*:*:*:windows:*:*

More vulnerabilities in Changingtec Tcb Servisign

CVE-2024-40720 — High (CVSS 8.8): The specific API in TCBServiSign Windows Version from CHANGING Information Technology does not properly validate…
CVE-2024-40719 — Medium (CVSS 6.5): The encryption strength of the authorization keys in CHANGING Information Technology TCBServiSign Windows Version is…
CVE-2024-40722 — Medium (CVSS 4.3): The specific API in TCBServiSign Windows Version from CHANGING Information Technology does does not properly validate…

All CVEs affecting Changingtec Tcb Servisign →

Other CWE-20 (Improper Input Validation) vulnerabilities

CVE-2026-48316 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48281 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48277 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48055 — Critical (CVSS 10.0): Streambert is a cross-platform Electron Desktop App to stream and download any video media. In versions 2.4.0 and…
CVE-2026-34910 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS…
CVE-2026-33587 — Critical (CVSS 10.0): Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and…

Browse all CWE-20 (Improper Input Validation) vulnerabilities →