CVE-2025-6400Public exploitNetwork attack vector

Authenticated router crash via unchecked service_type copy

Published Jun 21, 2025 · Updated Jun 23, 2025

Buffer overflow in TOTOLINK N300RH Firmware 6.1c.1390_B20191101 allows remote authenticated users to crash the router via an HTTP POST. The /boafrm/formPortFw handler copies the service_type parameter without checking its length, overflowing the destination buffer. A valid management session is required; exploitation interrupts routing service, and the published proof of concept demonstrates denial of service only.

CVSS severity8.8
High
EPSS probability0.89%
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 6.1c.1390_B20191101 allows remote authenticated users to crash the router via an HTTP POST. The /boafrm/formPortFw handler copies the service_type parameter without checking its length, overflowing the destination buffer. A valid management session is required; exploitation interrupts routing service, and the published proof of concept demonstrates denial of service only.

The record

CVE
CVE-2025-6400
Published
Jun 21, 2025
Updated
Jun 23, 2025
Vendor
TOTOLINK
Product
N300RH Firmware
Classifications
CWE-119, CWE-120, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 23, 2025Record 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=6.1c.1390_B20191101

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TOTOLINK · N300RH Firmwareversion=6.1c.1390_B20191101

Published CVSS scores

8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/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
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')
T1499Endpoint Denial of Service

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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