CVE-2026-31165Public exploitNetwork attack vector

Unauthenticated command execution via PPPoE service name

Published Apr 23, 2026 · Updated Apr 23, 2026

Command injection in TOTOLINK A3300R firmware 17.0.0cu.557_B20221024 allows remote attackers to execute commands via a crafted request. The cstecgi.cgi handler passes pppoeServiceName from setIpv6Cfg into Uci_Set_Str, which formats it with sprintf before CsteSystem sends the resulting command to execv. Network access to the router's CGI endpoint is sufficient; injected shell syntax runs commands in the appliance context without user interaction.

CVSS severity6.5
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in TOTOLINK A3300R firmware 17.0.0cu.557_B20221024 allows remote attackers to execute commands via a crafted request. The cstecgi.cgi handler passes pppoeServiceName from setIpv6Cfg into Uci_Set_Str, which formats it with sprintf before CsteSystem sends the resulting command to execv. Network access to the router's CGI endpoint is sufficient; injected shell syntax runs commands in the appliance context without user interaction.

The record

CVE
CVE-2026-31165
Published
Apr 23, 2026
Updated
Apr 23, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059.004Unix Shell

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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