CVE-2024-37635Public exploitNetwork attack vector

Router crash or code execution via oversized SSID

Published Jun 13, 2024 · Updated Aug 13, 2024

Stack-based buffer overflow in TOTOLINK A3700R Firmware 9.1.2u.6165_20211012 allows remote attackers to crash or control the router. The setWiFiBasicCfg function URL-decodes the supplied ssid value and stores the result on the stack without checking it against the destination buffer length. The proof of concept posts an oversized SSID to /cgi-bin/cstecgi.cgi; published evidence does not establish whether the shown session cookie must be valid.

CVSS severity9.8
Critical
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in TOTOLINK A3700R Firmware 9.1.2u.6165_20211012 allows remote attackers to crash or control the router. The setWiFiBasicCfg function URL-decodes the supplied ssid value and stores the result on the stack without checking it against the destination buffer length. The proof of concept posts an oversized SSID to /cgi-bin/cstecgi.cgi; published evidence does not establish whether the shown session cookie must be valid.

The record

CVE
CVE-2024-37635
Published
Jun 13, 2024
Updated
Aug 13, 2024
Vendor
TOTOLINK
Product
TOTOLINK A3700R Firmware
Classifications
CWE-121, CWE-120, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 13, 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=9.1.2u.6165_20211012

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TOTOLINK · TOTOLINK A3700R Firmwareversion=9.1.2u.6165_20211012

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
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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