CVE-2026-5178Public exploitNetwork attack vector

Authenticated OS command execution via vlanPriLan3

Published Mar 31, 2026 · Updated Mar 31, 2026

Command injection in TOTOLINK A3300R 17.0.0cu.557_b20221024 allows remote authenticated users to execute arbitrary OS commands. The setIptvCfg handler in /cgi-bin/cstecgi.cgi inserts the vlanPriLan3 value into a command string that CsteSystem passes to execv without neutralizing command syntax. A valid session and network access to the management interface are required, after which commands execute in the router firmware context.

CVSS severity6.3
Medium
EPSS probability4.03%
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 17.0.0cu.557_b20221024 allows remote authenticated users to execute arbitrary OS commands. The setIptvCfg handler in /cgi-bin/cstecgi.cgi inserts the vlanPriLan3 value into a command string that CsteSystem passes to execv without neutralizing command syntax. A valid session and network access to the management interface are required, after which commands execute in the router firmware context.

The record

CVE
CVE-2026-5178
Published
Mar 31, 2026
Updated
Mar 31, 2026
Vendor
TOTOLINK
Product
A3300R
Classifications
CWE-77, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 31, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=17.0.0cu.557_b20221024

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TOTOLINK · A3300Rversion=17.0.0cu.557_b20221024

Published CVSS scores

6.3VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
6.5VulDB CNAAV:N/AC:L/Au:S/C:P/I:P/A:P
5.3VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA: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 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-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059Command and Scripting Interpreter

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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