How severe is CVE-2024-40720?

CVE-2024-40720 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-2024-40720 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-40720?

CVE-2024-40720 affects Changingtec Tcb Servisign. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-40720?

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-2024-40720 have an EU (EUVD) identifier?

Yes. CVE-2024-40720 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-38585.

When was CVE-2024-40720 published?

CVE-2024-40720 was published on 2024-08-02 and last updated on 2026-06-17.

CVE-2024-40720

CVE-2024-40720 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% (43rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-38585
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 modify the `HKEY_CURRENT_USER` registry to execute arbitrary commands.

Frequently asked questions

What is CVE-2024-40720?: 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.
How severe is CVE-2024-40720?: CVE-2024-40720 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-2024-40720 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-40720?: CVE-2024-40720 affects Changingtec Tcb Servisign. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-40720?: 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-2024-40720 have an EU (EUVD) identifier?: Yes. CVE-2024-40720 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-38585.
When was CVE-2024-40720 published?: CVE-2024-40720 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-2024-40721 — High (CVSS 8.8): The specific API in TCBServiSign Windows Version from CHANGING Information Technology does not properly validate…
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CVE-2024-40722 — Medium (CVSS 4.3): The specific API in TCBServiSign Windows Version from CHANGING Information Technology does does not properly validate…

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