CVE-2025-5903Public exploitNetwork attack vector

Authenticated code execution via unchecked desc copy

Published Jun 9, 2025 · Updated Jun 10, 2025

Buffer overflow in TOTOLINK T10 4.1.8cu.5207 allows remote authenticated users to execute code through a crafted desc value. The setWiFiAclRules handler in /cgi-bin/cstecgi.cgi copies the attacker-controlled value into a fixed-size memory buffer without enforcing its length. Valid administrative access to the network management interface is required; exploitation can execute code in the router process or crash the service.

CVSS severity8.8
High
EPSS probability11.02%
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 T10 4.1.8cu.5207 allows remote authenticated users to execute code through a crafted desc value. The setWiFiAclRules handler in /cgi-bin/cstecgi.cgi copies the attacker-controlled value into a fixed-size memory buffer without enforcing its length. Valid administrative access to the network management interface is required; exploitation can execute code in the router process or crash the service.

The record

CVE
CVE-2025-5903
Published
Jun 9, 2025
Updated
Jun 10, 2025
Vendor
TOTOLINK
Product
T10
Classifications
CWE-119, CWE-120, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 10, 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=4.1.8cu.5207

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TOTOLINK · T10version=4.1.8cu.5207

Published CVSS scores

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
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')
T1190Exploit Public-Facing Application

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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