CVE-2026-5105Public exploitNetwork attack vector

Authenticated command execution via pptpPassThru interpolation

Published Mar 30, 2026 · Updated Mar 30, 2026

Command injection in TOTOLINK A3300R 17.0.0cu.557_b20221024 allows remote authenticated users to execute operating-system commands. The setVpnPassCfg handler in /cgi-bin/cstecgi.cgi formats the untrusted pptpPassThru value into a command string that CsteSystem passes to execv(). An authenticated management session can submit a crafted request, granting command execution with the router web service's privileges.

CVSS severity8.8
High
EPSS probability4.00%
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 operating-system commands. The setVpnPassCfg handler in /cgi-bin/cstecgi.cgi formats the untrusted pptpPassThru value into a command string that CsteSystem passes to execv(). An authenticated management session can submit a crafted request, granting command execution with the router web service's privileges.

The record

CVE
CVE-2026-5105
Published
Mar 30, 2026
Updated
Mar 30, 2026
Vendor
TOTOLINK
Product
A3300R
Classifications
CWE-74, CWE-77, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 30, 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

6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NVDCVSS: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-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
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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