CVE-2025-8246Public exploitNetwork attack vector

Router crash via oversized submit-url parameter

Published Jul 27, 2025 · Updated Jul 28, 2025

Buffer overflow in the HTTP POST handler of TOTOLINK X15 1.0.0-B20230714.1105 allows remote authenticated users to crash the router. The /boafrm/formRoute handler processes an oversized submit-url form value without enforcing the destination buffer's bounds. A valid sessionCheck value is present in the disclosed request, and the demonstrated consequence is denial of service rather than data access or modification.

CVSS severity7.5
High
EPSS probability0.80%
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 the HTTP POST handler of TOTOLINK X15 1.0.0-B20230714.1105 allows remote authenticated users to crash the router. The /boafrm/formRoute handler processes an oversized submit-url form value without enforcing the destination buffer's bounds. A valid sessionCheck value is present in the disclosed request, and the demonstrated consequence is denial of service rather than data access or modification.

The record

CVE
CVE-2025-8246
Published
Jul 27, 2025
Updated
Jul 28, 2025
Vendor
TOTOLINK
Product
X15
Classifications
CWE-120, CWE-119, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 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=1.0.0-B20230714.1105

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TOTOLINK · X15version=1.0.0-B20230714.1105

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
7.4VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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.

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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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
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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