CVE-2025-67445Public exploit

Web interface crash via oversized POST allocation

Published Feb 24, 2026 · Updated Feb 24, 2026

Denial of service in TOTOLINK X5000R firmware 9.1.0cu.2415_B20250515 allows remote attackers to crash its web interface via a large POST request. /cgi-bin/cstecgi.cgi trusts CONTENT_LENGTH and calls malloc for that size plus one without a bound, exhausting memory or triggering a segmentation fault. The attack requires LAN access and an unenforced lighttpd request-size limit; the bounded consequence is loss of the device management interface.

CVSS severity7.5
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in TOTOLINK X5000R firmware 9.1.0cu.2415_B20250515 allows remote attackers to crash its web interface via a large POST request. /cgi-bin/cstecgi.cgi trusts CONTENT_LENGTH and calls malloc for that size plus one without a bound, exhausting memory or triggering a segmentation fault. The attack requires LAN access and an unenforced lighttpd request-size limit; the bounded consequence is loss of the device management interface.

The record

CVE
CVE-2025-67445
Published
Feb 24, 2026
Updated
Feb 24, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 24, 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 vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
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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