CVE-2025-67186Public exploitNetwork attack vector

Unauthenticated code execution via unchecked URL copy

Published Feb 3, 2026 · Updated Feb 3, 2026

Buffer overflow in TOTOLINK A950RG 4.1.2cu.5204_B20210112 allows remote attackers to execute code or crash the router. The setUrlFilterRules function uses strcpy to copy the user-controlled url parameter into local buffer v13 without a length check, permitting adjacent stack data and the return address to be overwritten. CISA assesses that exploitation requires no privileges or user interaction; a crafted POST request can interrupt service or redirect execution.

CVSS severity9.8
Critical
EPSS probability0.72%
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 A950RG 4.1.2cu.5204_B20210112 allows remote attackers to execute code or crash the router. The setUrlFilterRules function uses strcpy to copy the user-controlled url parameter into local buffer v13 without a length check, permitting adjacent stack data and the return address to be overwritten. CISA assesses that exploitation requires no privileges or user interaction; a crafted POST request can interrupt service or redirect execution.

The record

CVE
CVE-2025-67186
Published
Feb 3, 2026
Updated
Feb 3, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 3, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS: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.

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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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

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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