CVE-2025-52907Network attack vector

Arbitrary file writes via incomplete character blocklist

Published Sep 24, 2025 · Updated Sep 24, 2025

Improper input validation in TOTOLINK X6000R firmware through V9.4.0cu.1360_B20241207 allows remote attackers to write arbitrary files. The setWizardCfg handler behind /cgi-bin/cstecgi.cgi applies an incomplete character blocklist, allowing unauthenticated requests to bypass its input check and reach file-write behavior. Access to the router web interface is sufficient; resulting writes can corrupt system files, persistently interrupt service, or alter boot scripts for persistent code execution.

CVSS severity7.3
High
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in TOTOLINK X6000R firmware through V9.4.0cu.1360_B20241207 allows remote attackers to write arbitrary files. The setWizardCfg handler behind /cgi-bin/cstecgi.cgi applies an incomplete character blocklist, allowing unauthenticated requests to bypass its input check and reach file-write behavior. Access to the router web interface is sufficient; resulting writes can corrupt system files, persistently interrupt service, or alter boot scripts for persistent code execution.

The record

CVE
CVE-2025-52907
Published
Sep 24, 2025
Updated
Sep 24, 2025
Vendor
TOTOLINK
Product
X6000R
Classifications
CWE-20, CAPEC-165, CAPEC-248, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 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=0 <=V9.4.0cu.1360_B20241207

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TOTOLINK · X6000Rversion=0 <=V9.4.0cu.1360_B20241207

Published CVSS scores

7.3Palo Alto NetworksCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:L/VI:H/VA:L/SC:H/SI:H/SA:H
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CAPEC-165File Manipulation
CAPEC-248Command Injection
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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