CVE-2024-40535Public exploitNetwork attack vector

Stack corruption via unchecked APN name length

Published Jul 16, 2024 · Updated Aug 22, 2024

Stack overflow in Shenzhen Libituo LBT-T300-T400 firmware 3.2 allows remote authenticated users to corrupt memory via a crafted APN name. The config_3g_para function accepts an oversized apn_name_3g value from an /apply.cgi request without enforcing the destination buffer's length. The published request uses HTTP Basic authentication; neither a crash nor code execution is documented.

CVSS severity9.8
Critical
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in Shenzhen Libituo LBT-T300-T400 firmware 3.2 allows remote authenticated users to corrupt memory via a crafted APN name. The config_3g_para function accepts an oversized apn_name_3g value from an /apply.cgi request without enforcing the destination buffer's length. The published request uses HTTP Basic authentication; neither a crash nor code execution is documented.

The record

CVE
CVE-2024-40535
Published
Jul 16, 2024
Updated
Aug 22, 2024
Vendor
Shenzhen Libituo Technology Co., Ltd.
Product
LBT-T300-T400 Firmware
Classifications
CWE-121
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Libituo Technology Co., Ltd. · LBT-T300-T400 Firmwareversion=3.2

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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