CVE-2024-37640Public exploit

Router crash via unchecked ssid5g decoding

Published Jun 14, 2024 · Updated Aug 2, 2024

Stack overflow in setWiFiEasyGuestCfg in TOTOLINK A3700R Firmware 9.1.2u.6165_20211012 allows remote attackers to crash the router. The handler URL-decodes the ssid5g field into stack storage without checking whether the decoded value exceeds the destination buffer. The crafted request reaches the CGI management endpoint from an adjacent network; the published proof of concept includes a session cookie, while CISA assesses that no privileges are required.

CVSS severity8.8
High
EPSS probability0.62%
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 setWiFiEasyGuestCfg in TOTOLINK A3700R Firmware 9.1.2u.6165_20211012 allows remote attackers to crash the router. The handler URL-decodes the ssid5g field into stack storage without checking whether the decoded value exceeds the destination buffer. The crafted request reaches the CGI management endpoint from an adjacent network; the published proof of concept includes a session cookie, while CISA assesses that no privileges are required.

The record

CVE
CVE-2024-37640
Published
Jun 14, 2024
Updated
Aug 2, 2024
Vendor
TOTOLINK
Product
TOTOLINK A3700R Firmware
Classifications
CWE-121, T1210
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 14, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=9.1.2u.6165_20211012

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

TOTOLINK · TOTOLINK A3700R Firmwareversion=9.1.2u.6165_20211012

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:A/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1210Exploitation of Remote Services

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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