CVE-2024-40719 | CHANGING Information Technology TCBServiSign Windows Version - Inadequate Encryption Strength

The encryption strength of the authorization keys in CHANGING Information Technology TCBServiSign Windows Version is insufficient. When a remote attacker tricks a victim into visiting a malicious website, TCBServiSign will treat that website as a legitimate server and interact with it.

Published: 2024-08-02 Last update: 2024-08-09 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-40719 is rated Low Risk (33.3/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.07%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2024-40719

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-09-08 0.03% 0.07% +0.03%
2 2025-03-17 0.09% 0.03% -0.05%
3 2024-08-06 — 0.09% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-40719

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 3.6 [email protected]

Weakness enumeration for CVE-2024-40719

Affected software / configurations for CVE-2024-40719

Vendor Product Version Raw CPE
changingtec tcb_servisign < 1.0.24.0318 cpe:2.3:a:changingtec:tcb_servisign:*:*:*:*:*:windows:*:*

References for CVE-2024-40719

cvelogic Threat Intelligence