HOMEVULNERABILITIESCVE-2024-40719
MEDIUM

CVE-2024-40719

CWE-326Published: August 2, 2024· Updated: Jun 17, 2026

6.5
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2024-40719 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 6.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected Vendors & Products

changingtec1 product(s)
tcb servisign
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://www.twcert.org.tw/en/cp-139-7970-e8ac5-2.html
ADVISORYhttps://www.twcert.org.tw/tw/cp-132-7964-5b266-1.html

All References (2)

→
https://www.twcert.org.tw/en/cp-139-7970-e8ac5-2.htmlThird Party Advisory
→
https://www.twcert.org.tw/tw/cp-132-7964-5b266-1.htmlThird Party Advisory

Quick Facts

CVE IDCVE-2024-40719
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-326
CISA KEVNo
Affected1 vendor(s)
PublishedAug 2, 2024

Related CVEs (CWE-326)

CVE-2020-6966
10.0
CVE-2026-44523
10.0
CVE-2014-9199
10.0
CVE-2014-9975
9.8
CVE-2025-12478
9.8
CVE-2017-8076
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2024-40719 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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