What is CVE-2024-40535?

CVE-2024-40535 is a critical-severity vulnerability in Szlbt Lbt-T300-T400, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2024-07-16.

How severe is CVE-2024-40535?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Szlbt Lbt-T300-T400

CVE-2024-40535

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.

Vulnerability class: Buffer Overflow

Published 2024-07-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (44.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Szlbt Lbt-T300-T400
Szlbt Lbt-T300-T400 Firmware — versions 3.2

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

github.com/tt01bolt/vul/blob/main/LBT-T300-T400_Buffer overflow.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2024-40535?: CVE-2024-40535 is a critical-severity vulnerability in Szlbt Lbt-T300-T400, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2024-07-16.
How severe is CVE-2024-40535?: Critical severity. CVSS v3 base score is 9.8 out of 10.