CVE-2024-40536Public exploitNetwork attack vector

Service interruption via unchecked 3G PIN length

Published Jul 16, 2024 · Updated Dec 6, 2024

Stack overflow in LBT-T300-T400 3.2 allows remote authenticated users to interrupt service through a crafted 3G PIN request. The config_3g_para function accepts the pin_3g_code field from /apply.cgi without restricting its length, causing the stack overflow. The only public request includes HTTP Basic authentication; public evidence does not establish unauthenticated reachability or whether the outcome is a crash, reboot, or code execution.

CVSS severity5.3
Medium
EPSS probability0.45%
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 LBT-T300-T400 3.2 allows remote authenticated users to interrupt service through a crafted 3G PIN request. The config_3g_para function accepts the pin_3g_code field from /apply.cgi without restricting its length, causing the stack overflow. The only public request includes HTTP Basic authentication; public evidence does not establish unauthenticated reachability or whether the outcome is a crash, reboot, or code execution.

The record

CVE
CVE-2024-40536
Published
Jul 16, 2024
Updated
Dec 6, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 6, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Application or System Exploitation Flood

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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