CVE-2025-4271Public exploitNetwork attack vector

Unauthenticated system-log disclosure via showSyslog request

Published May 5, 2025 · Updated May 5, 2025

Information disclosure in TOTOLINK A720R 4.1.5cu.374 allows remote attackers to read detailed system logs via a crafted POST request. /cgi-bin/cstecgi.cgi accepts the showSyslog topicurl value without authentication and returns kernel debug, interface, wireless, and hardware-operation logs. Network reachability to the router's management interface is sufficient; the disclosed logs expose operational details but no write or service-interruption capability is reported.

CVSS severity6.9
Medium
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in TOTOLINK A720R 4.1.5cu.374 allows remote attackers to read detailed system logs via a crafted POST request. /cgi-bin/cstecgi.cgi accepts the showSyslog topicurl value without authentication and returns kernel debug, interface, wireless, and hardware-operation logs. Network reachability to the router's management interface is sufficient; the disclosed logs expose operational details but no write or service-interruption capability is reported.

The record

CVE
CVE-2025-4271
Published
May 5, 2025
Updated
May 5, 2025
Vendor
TOTOLINK
Product
A720R
Classifications
CWE-200, CWE-284, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 5, 2025CVE publishedPublication date reported by the CVE source.
  2. May 5, 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=4.1.5cu.374

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TOTOLINK · A720Rversion=4.1.5cu.374

Published CVSS scores

5.0VulDBAV:N/AC:L/Au:N/C:P/I:N/A:N
5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
6.9VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
5.3VulDBCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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 exploitPublished

Weakness, pattern, technique

CWE-200Information Disclosure
CWE-284Improper Access Control
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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