CVE-2024-42547Public exploitNetwork attack vector

Memory corruption via unchecked http_host copy

Published Aug 12, 2024 · Updated Aug 13, 2024

Buffer overflow in TOTOLINK A3100R V4.1.2cu.5050_B20200504 allows remote attackers to corrupt memory through a crafted login request. The loginauth function passes the attacker-controlled http_host value to strcpy without checking the destination buffer's capacity. No authentication or user interaction is required; published evidence establishes the overwrite path but not whether it yields a crash or controlled code execution.

CVSS severity9.8
Critical
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in TOTOLINK A3100R V4.1.2cu.5050_B20200504 allows remote attackers to corrupt memory through a crafted login request. The loginauth function passes the attacker-controlled http_host value to strcpy without checking the destination buffer's capacity. No authentication or user interaction is required; published evidence establishes the overwrite path but not whether it yields a crash or controlled code execution.

The record

CVE
CVE-2024-42547
Published
Aug 12, 2024
Updated
Aug 13, 2024
Vendor
TOTOLINK
Product
A3100R
Classifications
CWE-120, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 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=V4.1.2cu.5050_B20200504

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TOTOLINK · A3100Rversion=V4.1.2cu.5050_B20200504

Published CVSS scores

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

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

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1190Exploit Public-Facing Application

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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