CVE-2024-40535: Shenzhen Libituo Technology Co., Ltd LBT-T300-T400 v3.2 was discovered to contain a stack overflow via the apn

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CRITICAL 9.8REMOTEMITIGATE

CVE-2024-40535 is a critical-severity flaw (CVSS 9.8) affecting lbt-t300-t400 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-121
Published	2024-07-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: szlbt

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-07-16 21:15 UTCPublished CVE record published
2026-06-17 07:46 UTCUpdated Record last modified

szlbt lbt-t300-t400 firmware MITIGATE

Affected: 3.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.2

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-40535?

lbt-t300-t400 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-40535 being exploited?

CVE-2024-40535 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-40535 affect?

CVE-2024-40535 affects lbt-t300-t400 firmware. Severity is critical (CVSS 9.8). 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.

How urgent is CVE-2024-40535?

Priority 56/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-29570 HIGH 7.8 MITIGATE An issue in Shenzhen Libituo Technology Co., Ltd LBT-T300-T400 v3.2 allows a local attacker to escalate privil
CVE-2024-40536 MEDIUM 5.3 MITIGATE Shenzhen Libituo Technology Co., Ltd LBT-T300-T400 v3.2 were discovered to contain a stack overflow via the pi
CVE-2024-39181 MEDIUM 6.5 MITIGATE Shenzhen Libituo Technology Co., Ltd LBT-T300-T400 v3.2 was discovered to contain a buffer overflow via the Ap

References

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