CVE-2026-6156Public exploitNetwork attack vector

Remote command execution via unsanitized Comment parameter

Published Apr 13, 2026 · Updated Apr 13, 2026

OS command injection in TOTOLINK A7100RU 7.4cu.2313_b20191024 allows remote attackers to execute arbitrary commands via a crafted Comment value. The setIpQosRules path in /cgi-bin/cstecgi.cgi formats Comment into a command string, passes it through Uci_Set_Str and CsteSystem, and reaches execv without neutralizing shell syntax. The published request includes a session cookie, while the CVE record describes remote exploitation without authentication; successful exploitation runs commands with the CGI service's privileges.

CVSS severity9.8
Critical
EPSS probability1.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in TOTOLINK A7100RU 7.4cu.2313_b20191024 allows remote attackers to execute arbitrary commands via a crafted Comment value. The setIpQosRules path in /cgi-bin/cstecgi.cgi formats Comment into a command string, passes it through Uci_Set_Str and CsteSystem, and reaches execv without neutralizing shell syntax. The published request includes a session cookie, while the CVE record describes remote exploitation without authentication; successful exploitation runs commands with the CGI service's privileges.

The record

CVE
CVE-2026-6156
Published
Apr 13, 2026
Updated
Apr 13, 2026
Vendor
TOTOLINK
Product
A7100RU
Classifications
CWE-78, CWE-77, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 13, 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=7.4cu.2313_b20191024

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TOTOLINK · A7100RUversion=7.4cu.2313_b20191024

Published CVSS scores

8.9VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
10.0VulDBAV:N/AC:L/Au:N/C:C/I:C/A:C
9.8VulDBCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command 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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