CVE-2026-51655Public exploitNetwork attack vector

MAC filter rule disclosure via unauthenticated CGI handler

Published Aug 28, 2026 · Updated Aug 28, 2026

Incorrect access control in TOTOLINK T6 4.1.5cu.748_B20211015 allows remote attackers to read MAC filter rules without authentication. The getMacFilterRules handler in web_cste/cgi-bin/cstecgi.cgi accepts a POST request whose topicurl selects that operation, then returns the configured rules without enforcing authentication. Network reachability to the device's management CGI is sufficient, and the disclosed entries expose its MAC-address filtering policy without modifying it.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect access control in TOTOLINK T6 4.1.5cu.748_B20211015 allows remote attackers to read MAC filter rules without authentication. The getMacFilterRules handler in web_cste/cgi-bin/cstecgi.cgi accepts a POST request whose topicurl selects that operation, then returns the configured rules without enforcing authentication. Network reachability to the device's management CGI is sufficient, and the disclosed entries expose its MAC-address filtering policy without modifying it.

The record

CVE
CVE-2026-51655
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1016
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 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

No CVSS assessment is available in this record.

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 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

T1016System Network Configuration Discovery

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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