CVE-2026-1623Public exploitNetwork attack vector

Authenticated command execution via shell-interpolated firmware filename

Published Jan 29, 2026 · Updated Jan 29, 2026

Command injection in TOTOLINK A7000R firmware 4.1cu.4154 allows remote authenticated users to execute commands via a crafted filename. The setUpgradeFW handler in /cgi-bin/cstecgi.cgi places the FileName value into a system command without neutralizing shell metacharacters. Access to the router management interface and low privileges are required; successful requests run attacker-selected commands on the appliance.

CVSS severity6.3
Medium
EPSS probability2.22%
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 A7000R firmware 4.1cu.4154 allows remote authenticated users to execute commands via a crafted filename. The setUpgradeFW handler in /cgi-bin/cstecgi.cgi places the FileName value into a system command without neutralizing shell metacharacters. Access to the router management interface and low privileges are required; successful requests run attacker-selected commands on the appliance.

The record

CVE
CVE-2026-1623
Published
Jan 29, 2026
Updated
Jan 29, 2026
Vendor
TOTOLINK
Product
A7000R
Classifications
CWE-74, CWE-77, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 29, 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=4.1cu.4154

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TOTOLINK · A7000Rversion=4.1cu.4154

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

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')
T1059.004Command and Scripting Interpreter: Unix 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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