CVE-2026-7219Public exploitNetwork attack vector

Authenticated service crash via unchecked entry_name copy

Published Apr 28, 2026 · Updated Apr 28, 2026

Stack-based buffer overflow in TOTOLINK N300RT 3.4.0-B20250430 allows remote authenticated users to crash its Boa web service. The formIpQoS handler copies the user-controlled entry_name POST value with strcpy into a 192-byte stack buffer without checking its length, allowing data past 324 bytes to overwrite the saved return address. A valid sessionCheck token plus nonempty ipStart and ipEnd values are required; the published proof of concept makes the management interface inaccessible, while code execution is not demonstrated.

CVSS severity7.2
High
EPSS probability0.59%
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 N300RT 3.4.0-B20250430 allows remote authenticated users to crash its Boa web service. The formIpQoS handler copies the user-controlled entry_name POST value with strcpy into a 192-byte stack buffer without checking its length, allowing data past 324 bytes to overwrite the saved return address. A valid sessionCheck token plus nonempty ipStart and ipEnd values are required; the published proof of concept makes the management interface inaccessible, while code execution is not demonstrated.

The record

CVE
CVE-2026-7219
Published
Apr 28, 2026
Updated
Apr 28, 2026
Vendor
TOTOLINK
Product
N300RT
Classifications
CWE-119, CWE-120, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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=3.4.0-B20250430

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TOTOLINK · N300RTversion=3.4.0-B20250430

Published CVSS scores

7.2VulDBCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
7.3VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
8.3VulDBAV:N/AC:L/Au:M/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
Privilegesauthenticated
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')
T1499.004Application or System Exploitation

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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