CVE-2026-7747Public exploitNetwork attack vector

Unauthenticated memory corruption via Password parameter

Published May 4, 2026 · Updated May 4, 2026

Buffer overflow in TOTOLINK N300RH firmware 3.2.4-B20220812 allows remote attackers to corrupt memory via a crafted Password value. The loginauth function in /cgi-bin/cstecgi.cgi fails to bound the Password parameter before copying it into a memory buffer. No authentication or user interaction is required, but the public record does not establish whether exploitation causes a crash or code execution.

CVSS severity9.8
Critical
EPSS probability0.61%
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 N300RH firmware 3.2.4-B20220812 allows remote attackers to corrupt memory via a crafted Password value. The loginauth function in /cgi-bin/cstecgi.cgi fails to bound the Password parameter before copying it into a memory buffer. No authentication or user interaction is required, but the public record does not establish whether exploitation causes a crash or code execution.

The record

CVE
CVE-2026-7747
Published
May 4, 2026
Updated
May 4, 2026
Vendor
TOTOLINK
Product
N300RH Firmware
Classifications
CWE-119, CWE-120, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 4, 2026CVE publishedPublication date reported by the CVE source.
  2. May 4, 2026Record 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=3.2.4-B20220812

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TOTOLINK · N300RH Firmwareversion=3.2.4-B20220812

Published CVSS scores

8.9VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
9.8VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0VulDBAV:N/AC:L/Au:N/C:C/I:C/A:C

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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
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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