Cyber Resilience

CVE-2024-40535

CriticalPublic PoC

Published: 16 July 2024

Published
16 July 2024
Modified
20 August 2025
KEV Added
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Patch
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CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0045 64.0th percentile
Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2024-40535 is a critical-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Szlbt Lbt-T300-T400 Firmware. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 36.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

Shenzhen Libituo Technology Co., Ltd LBT-T300-T400 v3.2 was discovered to contain a stack overflow via the apn_name_3g parameter in the config_3g_para function.

CWE(s)
CWE-121

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Why these techniques?

The stack overflow vulnerability in the config_3g_para function via the apn_name_3g parameter enables remote code execution by exploiting a public-facing configuration interface on the device.

Affected Assets

szlbt
lbt-t300-t400 firmware
3.2

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References